N-CSR 1 main.htm

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM N-CSR

CERTIFIED SHAREHOLDER REPORT OF REGISTERED

MANAGEMENT INVESTMENT COMPANIES

Investment Company Act file number 811-7139

Fidelity Hereford Street Trust
(Exact name of registrant as specified in charter)

82 Devonshire St., Boston, Massachusetts 02109
(Address of principal executive offices) (Zip code)

Eric D. Roiter, Secretary

82 Devonshire St.

Boston, Massachusetts 02109
(Name and address of agent for service)

Registrant's telephone number, including area code: 617-563-7000

Date of fiscal year end:	April 30

Date of reporting period:	April 30, 2007

Item 1. Reports to Stockholders

Fidelity®

Money Market

Fund

Annual Report

April 30, 2007

(2_fidelity_logos) (Registered_Trademark)

Chairman's Message	<Click Here>	Ned Johnson's message to shareholders.
Shareholder Expense Example	<Click Here>	An example of shareholder expenses.
Investment Changes/ Performance	<Click Here>	A summary of major shifts in the fund's investments over the past six months and one year, and performance information.
Investments	<Click Here>	A complete list of the fund's investments.
Financial Statements	<Click Here>	Statements of assets and liabilities, operations, and changes in net assets, as well as financial highlights.
Notes	<Click Here>	Notes to the financial statements.
Report of Independent Registered Public Accounting Firm	<Click Here>
Trustees and Officers	<Click Here>
Distributions	<Click Here>
Proxy Voting Results	<Click Here>

To view a fund's proxy voting guidelines and proxy voting record for the 12-month period ended June 30, visit www.fidelity.com/proxyvotingresults or visit the Securities and Exchange Commission's (SEC) web site at www.sec.gov. You may also call 1-800-544-8544 to request a free copy of the proxy voting guidelines.

Standard & Poor's, S&P and S&P 500 are registered service marks of The McGraw-Hill Companies, Inc. and have been licensed for use by Fidelity Distributors Corporation.

Other third party marks appearing herein are the property of their respective owners.

All other marks appearing herein are registered or unregistered trademarks or service marks of FMR Corp. or an affiliated company.

This report and the financial statements contained herein are submitted for the general information of the shareholders of the fund. This report is not authorized for distribution to prospective investors in the fund unless preceded or accompanied by an effective prospectus.

A fund files its complete schedule of portfolio holdings with the SEC for the first and third quarters of each fiscal year on Form N-Q. Forms N-Q are available on the SEC's web site at http://www.sec.gov. A fund's Forms N-Q may be reviewed and copied at the SEC's Public Reference Room in Washington, DC. Information regarding the operation of the SEC's Public Reference Room may be obtained by calling 1-800-SEC-0330. For a complete list of a fund's portfolio holdings, view the most recent quarterly holdings report, semiannual report, or annual report on Fidelity's web site at http://www.fidelity.com/holdings.

NOT FDIC INSURED ·MAY LOSE VALUE ·NO BANK GUARANTEE

Neither the fund nor Fidelity Distributors Corporation is a bank.

Annual Report

Chairman's Message

(photo_of_Edward_C_Johnson_3d)

Dear Shareholder:

Substantial single-day losses are not uncommon in the equity markets, and when they occur - as in late February - investors can be better served in the long term by buying good stocks at lower prices than by moving their money to the sidelines. While financial markets are always unpredictable, there are a number of time-tested principles that can put the historical odds in your favor.

One of the basic tenets is to invest for the long term. Over time, riding out the markets' inevitable ups and downs has proven much more effective than selling into panic or chasing the hottest trend. Even missing only a few of the markets' best days can significantly diminish investor returns. Patience also affords the benefits of compounding - of earning interest on additional income or reinvested dividends and capital gains. There are tax advantages and cost benefits to consider as well. The more you sell, the more taxes you pay, and the more you trade, the higher the costs. While staying the course doesn't eliminate risk, it can considerably lessen the effect of short-term declines.

You can further manage your investing risk through diversification. And today, more than ever, geographic diversification should be taken into account. Studies indicate that asset allocation is the single most important determinant of a portfolio's long-term success. The right mix of stocks, bonds and cash - aligned to your particular risk tolerance and investment objective - is very important. Age-appropriate rebalancing is also an essential aspect of asset allocation. For younger investors, an emphasis on equities - which historically have been the best performing asset class over time - is encouraged. As investors near their specific goal, such as retirement or sending a child to college, consideration may be given to replacing volatile assets (e.g. common stocks) with more-stable fixed investments (bonds or savings plans).

A third investment principle - investing regularly - can help lower the average cost of your purchases. Investing a certain amount of money each month or quarter helps ensure you won't pay for all your shares at market highs. This strategy - known as dollar cost averaging - also reduces unconstructive "emotion" from investing, helping shareholders avoid selling weak performers just prior to an upswing, or chasing a hot performer just before a correction.

We invite you to contact us via the Internet, through our Investor Centers or over the phone. It is our privilege to provide you the information you need to make the investments that are right for you.

Sincerely,

/s/Edward C. Johnson 3d

Edward C. Johnson 3d

Annual Report

Shareholder Expense Example

As a shareholder of the Fund, you incur two types of costs: (1) transaction costs, and (2) ongoing costs, including management fees and other Fund expenses. This Example is intended to help you understand your ongoing costs (in dollars) of investing in the Fund and to compare these costs with the ongoing costs of investing in other mutual funds.

The Example is based on an investment of $1,000 invested at the beginning of the period and held for the entire period (November 1, 2006 to April 30, 2007).

Actual Expenses

The first line of the accompanying table provides information about actual account values and actual expenses. You may use the information in this line, together with the amount you invested, to estimate the expenses that you paid over the period. Simply divide your account value by $1,000.00 (for example, an $8,600 account value divided by $1,000.00 = 8.6), then multiply the result by the number in the first line under the heading entitled "Expenses Paid During Period" to estimate the expenses you paid on your account during this period. A small balance maintenance fee of $12.00 that is charged once a year may apply for certain accounts with a value of less than $2,000. This fee is not included in the table below. If it was, the estimate of expenses you paid during the period would be higher, and your ending account value lower, by this amount.

Hypothetical Example for Comparison Purposes

The second line of the accompanying table provides information about hypothetical account values and hypothetical expenses based on the Fund's actual expense ratio and an assumed rate of return of 5% per year before expenses, which is not the Fund's actual return. The hypothetical account values and expenses may not be used to estimate the actual ending account balance or expenses you paid for the period. You may use this information to compare the ongoing costs of investing in the Fund and other funds. To do so, compare this 5% hypothetical example with the 5% hypothetical examples that appear in the shareholder reports of the other funds. A small balance maintenance fee of $12.00 that is charged once a year may apply for certain accounts with a value of less than $2,000. This fee is not included in the table below. If it was, the estimate of expenses you paid during the period would be higher, and your ending account value lower, by this amount.

Please note that the expenses shown in the table are meant to highlight your ongoing costs only and do not reflect any transaction costs. Therefore, the second line of the table is useful in comparing ongoing costs only, and will not help you determine the relative total costs of owning different funds.

	Beginning Account Value November 1, 2006	Ending Account Value April 30, 2007	Expenses Paid During Period* November 1, 2006 to April 30, 2007
Actual	$ 1,000.00	$ 1,025.00	$ 2.11
Hypothetical (5% return per year before expenses)	$ 1,000.00	$ 1,022.71	$ 2.11

* Expenses are equal to the Fund's annualized expense ratio of .42%; multiplied by the average account value over the period, multiplied by 181/365 (to reflect the one-half year period).

Annual Report

Investment Changes/Performance

Maturity Diversification
Days	% of fund's investments 4/30/07	% of fund's investments 10/31/06	% of fund's investments 4/30/06
0 - 30	63.5	55.3	68.8
31 - 90	21.0	25.4	22.8
91 - 180	4.2	13.3	2.7
181 - 397	11.3	6.0	5.7
Weighted Average Maturity
	4/30/07	10/31/06	4/30/06
Fidelity Money Market Fund	51 Days	55 Days	38 Days
All Taxable Money Market Funds Average*	40 Days	42 Days	38 Days

Asset Allocation (% of fund's net assets)
As of April 30, 2007		As of October 31, 2006
	Corporate Bonds 0.2%		Corporate Bonds 0.4%
	Commercial Paper 15.0%		Commercial Paper 22.1%
	Bank CDs, BAs, TDs, and Notes 55.8%		Bank CDs, BAs, TDs, and Notes 54.1%
	Government Securities 0.0%		Government Securities 2.5%
	Repurchase Agreements 27.1%		Repurchase Agreements 20.1%
	Other Investments 1.9%		Other Investments 0.7%
	Net Other Assets** 0.0%		Net Other Assets 0.1%

**Net Other Assets are not included in the pie chart.

Current and Historical Seven-Day Yields

	5/1/07	1/30/07	10/31/06	8/1/06	5/2/06
Fidelity Money Market Fund	5.00%	5.04%	5.02%	5.00%	4.52%

Yield refers to the income paid by the fund over a given period. Yields for money market funds are usually for seven-day periods, as they are here, though they are expressed as annual percentage rates. Past performance is no guarantee of future results. Yield will vary and it is possible to lose money by investing in the fund.

*Source: iMoneyNet, Inc.

Annual Report

Investments April 30, 2007

Showing Percentage of Net Assets

Corporate Bonds - 0.2%
	Due Date	Yield (a)	Principal Amount (000s)	Value (000s)
Verizon Global Funding Corp.
	6/15/07	5.75%	$ 16,855	$ 16,860
TOTAL CORPORATE BONDS				16,860
Certificates of Deposit - 17.5%

London Branch, Eurodollar, Foreign Banks - 2.5%
Barclays Bank PLC
	6/11/07	5.44	30,000	30,000
Credit Industriel et Commercial
	5/8/07 to 7/30/07	5.36 to 5.37	98,000	98,000
Landesbank Hessen-Thuringen
	7/26/07 to 9/17/07	5.36 to 5.37	51,000	51,000
				179,000
New York Branch, Yankee Dollar, Foreign Banks - 15.0%
Barclays Bank PLC
	4/16/08 to 5/5/08	5.35 to 5.36	218,000	218,000
Canadian Imperial Bank of Commerce
	5/15/07 to 5/23/07	5.32 to 5.41 (c)	85,000	85,000
Credit Suisse First Boston
	6/12/07 to 7/23/07	5.32 to 5.34 (c)	148,000	148,000
Credit Suisse Group
	6/4/07	5.40	29,000	29,000
Deutsche Bank AG
	6/4/07 to 4/24/08	5.37 to 5.41 (c)	144,000	144,000
Fortis Banque SA
	6/26/07	5.33	38,000	38,000
Landesbank Baden-Wuert
	5/24/07	5.50	30,000	29,996
Mizuho Corporate Bank Ltd.
	5/8/07 to 6/1/07	5.31 to 5.34	43,000	43,000
Natexis Banques Populaires NY CD
	12/12/07 to 1/15/08	5.40	194,000	194,000
Societe Generale
	4/2/08	5.36	74,000	74,000
Sumitomo Mitsui Banking Corp.
	5/21/07 to 5/29/07	5.31	56,000	56,000
Certificates of Deposit - continued
	Due Date	Yield (a)	Principal Amount (000s)	Value (000s)
New York Branch, Yankee Dollar, Foreign Banks - 15.0%
Toronto-Dominion Bank
	6/18/07	5.68%	$ 20,000	$ 19,995
UniCredito Italiano Spa, New York
	7/30/07	5.32 (c)	10,000	9,999
				1,088,990
TOTAL CERTIFICATES OF DEPOSIT				1,267,990
Commercial Paper - 15.0%

American Water Capital Corp.
	5/14/07	5.44 (b)	1,000	998
Bavaria TRR Corp.
	5/21/07	5.31	30,000	29,912
Burlington Northern Santa Fe Corp.
	5/17/07	5.38 (b)	3,000	2,993
Capital One Multi-Asset Execution Trust
	5/9/07	5.32	3,000	2,996
Citigroup Funding, Inc.
	5/3/07 to 5/8/07	5.34 to 5.35	30,000	29,977
ConocoPhillips
	5/1/07	5.33	3,000	3,000
ConocoPhillips Qatar Funding Ltd.
	6/20/07 to 8/10/07	5.37 to 5.42 (b)	4,000	3,960
Countrywide Financial Corp.
	5/1/07 to 6/21/07	5.33 to 5.36	102,171	101,985
CVS Corp.
	5/3/07 to 5/18/07	5.36 to 5.38	35,600	35,532
DaimlerChrysler NA Holding Corp.
	5/4/07 to 5/30/07	5.38 to 5.44	24,250	24,208
Devon Energy Corp.
	5/8/07 to 8/16/07	5.34 to 5.44	27,000	26,693
Dominion Resources, Inc.
	5/9/07 to 5/30/07	5.36 to 5.37	23,000	22,916
Emerald (MBNA Credit Card Master Note Trust)
	6/12/07	5.32	14,000	13,914
Fortune Brands, Inc.
	5/4/07 to 7/13/07	5.35 to 5.40	20,500	20,371
Commercial Paper - continued
	Due Date	Yield (a)	Principal Amount (000s)	Value (000s)
France Telecom SA
	5/30/07 to 7/2/07	5.38 to 5.40% (b)	$ 6,000	$ 5,959
Giro Funding US Corp.
	5/3/07 to 5/31/07	5.31 to 5.34	53,000	52,820
Hypo Real Estate Bank International AG
	5/24/07 to 7/10/07	5.36 to 5.37	10,000	9,911
ITT Corp.
	5/24/07 to 7/30/07	5.35 to 5.40	12,000	11,896
Kellogg Co.
	6/7/07 to 7/16/07	5.38 to 5.39	7,000	6,941
Liberty Harbour II CDO Ltd.
	5/25/07	5.35 (b)	15,000	14,947
Michigan Gen. Oblig.
	10/4/07	5.41	11,900	11,900
Monument Gardens Funding
	5/23/07 to 6/13/07	5.31 to 5.32	105,267	104,707
Motown Notes Program
	5/7/07 to 6/21/07	5.35 to 5.37	28,000	27,863
National Grid USA
	6/29/07 to 7/20/07	5.38	9,500	9,406
Nelnet Student Loan Funding LLC
	5/8/07	5.34	3,000	2,997
Nissan Motor Acceptance Corp.
	5/2/07 to 6/27/07	5.37 to 5.38	15,437	15,384
Paradigm Funding LLC
	7/24/07 to 8/10/07	5.35 to 5.36	40,000	39,477
Park Avenue Receivables Corp.
	5/21/07	5.30 (b)	80,000	79,766
Park Granada LLC
	6/15/07	5.33	20,000	19,868
Park Sienna LLC
	5/29/07 to 8/31/07	5.28 to 5.34	64,469	63,592
Rockies Express Pipeline LLC
	5/7/07 to 7/20/07	5.43 to 5.44 (b)	16,000	15,868
SABMiller PLC
	5/4/07	5.39	1,000	1,000
Spectra Energy Capital LLC
	5/8/07 to 5/21/07	5.37 to 5.40 (b)	3,000	2,995
Commercial Paper - continued
	Due Date	Yield (a)	Principal Amount (000s)	Value (000s)
Stratford Receivables Co. LLC
	5/14/07 to 6/13/07	5.33 to 5.34%	$ 53,000	$ 52,798
Textron Financial Corp.
	5/31/07	5.35	1,000	996
The Walt Disney Co.
	5/18/07 to 5/23/07	5.36 to 5.38	4,000	3,988
Time Warner Cable, Inc.
	5/1/07 to 7/23/07	5.37 to 5.40	48,565	48,397
Time Warner, Inc.
	5/3/07 to 6/18/07	5.36 to 5.40 (b)	43,000	42,847
Virginia Electric & Power Co.
	5/1/07 to 5/14/07	5.35 to 5.38	15,500	15,485
Weatherford International Ltd.
	5/4/07 to 5/21/07	5.35 to 5.36 (b)	7,394	7,380
WellPoint, Inc.
	5/21/07	5.39	4,000	3,988
Whirlpool Corp.
	5/31/07	5.38	5,000	4,978
Wisconsin Energy Corp.
	5/11/07 to 8/8/07	5.35 to 5.46	12,000	11,960
Xcel Energy, Inc.
	10/10/07	5.49	6,000	5,856
XTO Energy, Inc.
	6/25/07 to 7/9/07	5.37 to 5.40	8,000	7,929
Zenith Funding Corp.
	6/7/07	5.32 (b)	62,046	61,711
TOTAL COMMERCIAL PAPER				1,085,065
Bank Notes - 0.1%

M&I Marshall & Ilsley Bank
	5/15/07	5.32 (c)	5,000	5,000
Master Notes - 3.6%
	Due Date	Yield (a)	Principal Amount (000s)	Value (000s)
Asset Funding Co. III LLC
	5/8/07	5.38 to 5.39% (c)(e)	$ 72,000	$ 72,000
Bear Stearns & Co., Inc.
	10/29/07	5.38 (c)	38,000	38,000
Countrywide Commercial Re Finance, Inc.
	5/1/07	5.46 (c)(e)	44,000	44,000
Goldman Sachs Group, Inc.
	5/30/07	5.41 (c)(e)	55,000	55,000
Lehman Brothers Holdings, Inc.
	5/11/07 to 8/28/07	5.43 to 5.46 (c)(e)	27,000	27,000
Lehman Commercial Paper, Inc.
	5/1/07	5.46 (c)(e)	28,000	28,000
TOTAL MASTER NOTES				264,000
Medium-Term Notes - 30.6%

AIG Matched Funding Corp.
	5/15/07	5.35 (c)	72,000	72,000
	5/15/07 to 11/15/07	5.35 to 5.37 (b)(c)	74,000	74,000
Allstate Life Global Funding II
	5/8/07 to 5/15/07	5.36 to 5.40 (b)(c)	20,000	20,000
ASIF Global Financing XXX
	5/23/07	5.34 (b)(c)	25,000	25,000
Australia & New Zealand Banking Group Ltd.
	5/23/07	5.32 (b)(c)	18,000	18,000
Banco Santander Totta SA
	5/15/07	5.32 (b)(c)	95,000	95,001
Banesto SA
	7/18/07	5.33 (b)(c)	37,000	37,000
Banque Federative du Credit Mutuel (BFCM)
	5/14/07	5.32 (b)(c)	35,000	35,000
Bayerische Landesbank Girozentrale
	5/21/07	5.40 (c)	45,000	45,000
BMW U.S. Capital LLC
	5/15/07	5.34 (c)	8,000	8,000
Caixa Catalunya
	6/7/07	5.34 (c)	29,000	29,000
Medium-Term Notes - continued
	Due Date	Yield (a)	Principal Amount (000s)	Value (000s)
Caja Madrid SA
	7/19/07	5.36% (c)	$ 19,000	$ 19,000
Calyon New York Branch
	5/2/07	5.26 (c)	5,000	5,000
CIT Group, Inc.
	6/20/07	5.58 (c)	4,000	4,004
Compagnie Financiere du Credit Mutuel
	6/11/07	5.36 (c)	23,000	23,000
Countrywide Bank, Alexandria Virginia
	5/15/07 to 5/23/07	5.33 (c)	24,000	23,999
Cullinan Finance Corp.
	5/27/07 to 4/15/08	5.32 to 5.38 (b)(c)	99,000	98,996
Cullinan Finance Ltd./Corp. MTN 144A
	4/25/08	5.31 (b)	18,000	18,000
DnB NOR Bank ASA
	5/25/07	5.31 (b)(c)	10,000	10,000
General Electric Capital Corp.
	5/7/07 to 5/17/07	5.36 to 5.45 (c)	179,000	179,001
Harrier Finance Funding LLC
	6/20/07 to 7/11/07	5.30 to 5.34 (b)(c)	17,000	16,999
HBOS Treasury Services PLC
	6/25/07	5.42 (c)	60,000	60,000
HSBC Finance Corp.
	5/8/07 to 5/24/07	5.33 to 5.37 (c)	72,000	72,000
HSH Nordbank AG
	5/21/07 to 5/23/07	5.33 to 5.35 (b)(c)	61,000	61,000
ING USA Annuity & Life Insurance Co.
	6/25/07	5.44 (c)(e)	11,000	11,000
Intesa Bank Ireland PLC
	5/25/07	5.32 (b)(c)	88,000	88,000
K2 (USA) LLC
	6/11/07	5.30 (b)(c)	17,000	16,999
Kestrel Funding PLC US LLC 144A
	5/1/07	5.34 (b)(c)	4,000	4,000
Merrill Lynch & Co., Inc.
	5/4/07 to 5/24/07	5.30 to 5.40 (c)	118,000	118,006
Medium-Term Notes - continued
	Due Date	Yield (a)	Principal Amount (000s)	Value (000s)
Metropolitan Life Global Funding I
	5/8/07 to 5/29/07	5.35 to 5.43% (b)(c)	$ 15,000	$ 15,000
Morgan Stanley
	5/1/07 to 6/7/07	5.38 to 5.42 (c)	90,813	90,826
Natexis Banques Populaires NY CD
	5/2/07	5.28 (c)	46,000	45,998
National Rural Utils. Coop. Finance Corp.
	5/4/07	5.30 (c)	3,000	3,000
Nordea Bank AB
	5/2/07	5.26 (c)	36,000	35,998
Pacific Life Global Funding
	5/14/07	5.37 (c)	5,000	5,000
	5/4/07	5.37 (b)(c)	5,000	5,000
RACERS
	5/22/07	5.37 (b)(c)	50,000	50,000
Royal Bank of Scotland PLC
	5/21/07	5.33 (b)(c)	45,000	45,000
SBC Communications, Inc.
	6/5/07	5.10 (b)	10,200	10,187
Security Life of Denver Insurance Co.
	5/29/07	5.45 (c)(e)	8,000	8,000
Sigma Finance, Inc.
	5/15/07 to 6/11/07	5.30 to 5.32 (b)(c)	50,000	49,999
Skandinaviska Enskilda Banken AB
	5/8/07 to 6/22/07	5.27 to 5.32 (c)	104,000	103,988
Southern Co.
	6/20/07	5.36 (c)	6,000	6,000
UniCredito Italiano Bank (Ireland) PLC
	5/14/07 to 5/15/07	5.33 (b)(c)	61,000	61,000
	5/30/07	5.29 (c)	25,000	24,999
UniCredito Italiano Spa, New York
	5/20/07 to 6/13/07	5.33 to 5.35 (c)	59,000	58,997
Verizon Communications, Inc.
	6/15/07	5.35 (c)	45,000	45,000
Vodafone Group PLC
	6/29/07	5.41 (c)	9,000	9,000
Medium-Term Notes - continued
	Due Date	Yield (a)	Principal Amount (000s)	Value (000s)
Wachovia Asset Securitization Issuance LLC
	5/25/07	5.31% (b)(c)	$ 4,282	$ 4,282
Washington Mutual Bank
	5/16/07 to 6/26/07	5.34 to 5.40 (c)	66,500	66,506
Washington Mutual Bank FA
	8/24/07	5.34 (b)(c)	46,000	46,000
Wells Fargo & Co.
	5/2/07 to 5/15/07	5.33 to 5.38 (c)	82,500	82,500
WestLB AG
	5/10/07 to 6/29/07	5.38 to 5.40 (b)(c)	50,000	50,000
Westpac Banking Corp.
	6/11/07	5.40 (c)	10,000	10,000
TOTAL MEDIUM-TERM NOTES				2,219,285
Short-Term Notes - 3.2%

Jackson National Life Insurance Co.
	7/1/07	5.40 (c)(e)	34,000	34,000
Metropolitan Life Insurance Co.
	7/2/07	5.45 (c)(e)	25,000	25,000
Monumental Life Insurance Co.
	5/1/07	5.46 to 5.56 (c)(e)	64,000	64,000
New York Life Insurance Co.
	6/30/07	5.43 (c)(e)	60,000	60,000
Transamerica Occidental Life Insurance Co.
	5/1/07	5.53 (c)(e)	50,000	50,000
TOTAL SHORT-TERM NOTES				233,000
Asset-Backed Securities - 1.9%
	Due Date	Yield (a)	Principal Amount (000s)	Value (000s)
Aardvark ABS CDO
	2/6/08	5.40% (b)(c)	$ 31,000	$ 31,000
Le Monde CDO I PLC / LLC
	3/5/08	5.37 (b)(c)	32,000	31,997
Master Funding Trust I
	6/25/07	5.35 (b)(c)	6,000	6,000
	7/25/07 - 10/25/07	5.35 (c)	28,000	28,000
PASA Funding 2007 Ltd.
	4/7/08	5.34 (b)(c)	39,000	39,000
Wind Trust
	1/25/08	5.32 (b)(c)	5,000	5,000
TOTAL ASSET-BACKED SECURITIES				140,997
Municipal Securities - 0.8%

Catholic Health Initiatives Series A
6/7/07	5.37	4,900		4,900
Catholic Health Initiatives Series B
6/14/07	5.37	6,800		6,800
Connecticut Hsg. Fin. Auth. Series F2, VRDN
5/7/07	5.32 (c)	19,425		19,425
North Carolina Med. Care Commission Health Care Facilities Rev. Series A, VRDN
5/7/07	3.97 (c)	25,450		25,450
TOTAL MUNICIPAL SECURITIES			56,575

Repurchase Agreements - 27.1%
	Maturity Amount (000s)
In a joint trading account at 5.27% dated 4/30/07 due 5/1/07 (Collateralized by U.S. Government Obligations) #	$ 499		499
With:
Banc of America Securities LLC at:
5.36%, dated 4/30/07 due 5/1/07 (Collateralized by Commercial Paper Obligations valued at $160,140,000, 0%, 5/15/07 - 7/20/07)	157,023		157,000
Repurchase Agreements - continued
	Maturity Amount (000s)		Value (000s)
With: - continued
Banc of America Securities LLC at:
5.44%, dated 4/30/07 due 5/1/07 (Collateralized by Mortgage Loan Obligations valued at $157,500,001, 0% - 9.32%, 7/31/16 - 12/20/46)	$ 150,023		$ 150,000
Citigroup Global Markets, Inc. At:
5.37%, dated 4/30/07 due 5/1/07 (Collateralized by Corporate Obligations valued at $149,940,000, 5.85% - 8.46%, 5/15/12 - 2/15/47)	147,022		147,000
5.41%, dated 4/30/07 due 5/1/07 (Collateralized by Corporate Obligations valued at $190,005,000, 5.85% - 10.13%, 9/1/08 - 2/1/17)	181,027		181,000
Credit Suisse First Boston, Inc. At 5.37%, dated 4/30/07 due 5/1/07 (Collateralized by Corporate Obligations valued at $156,061,975, 3.5% - 9%, 6/1/07 - 8/15/49)	153,023		153,000
Deutsche Bank Securities, Inc. at:
5.35%, dated 4/2/07 due 5/2/07 (Collateralized by Corporate Obligations valued at $29,580,000, 5.25% - 7%, 1/15/14 - 7/1/35)	29,129		29,000
5.36%, dated:
4/19/07 due 7/19/07 (Collateralized by Mortgage Loan Obligations valued at $19,950,001, 5.52% - 6.42%, 2/19/35 - 7/20/46)	19,257		19,000
4/30/07 due 7/30/07 (Collateralized by Corporate Obligations valued at $28,350,000, 2.25% - 3%, 6/15/13 - 1/15/27)	27,366		27,000
5.37%, dated:
2/12/07 due 5/14/07 (Collateralized by Mortgage Loan Obligations valued at $40,950,001, 4.23% - 6.5%, 6/25/35 - 9/20/51)	39,529		39,000
2/13/07 due 5/15/07 (Collateralized by Corporate Obligations valued at $39,780,000, 4.01% - 5.83%, 9/10/07 - 10/1/12)	39,529		39,000
Goldman Sachs & Co. at:
5.4%, dated 4/26/07 due 5/25/07 (Collateralized by Equity Securities valued at $18,900,023) (c)(d)	18,078		18,000
5.41%, dated 2/21/07 due 5/24/07 (Collateralized by Corporate Obligations valued at $79,800,001, 6.3% - 12.35%, 6/1/11 - 1/15/32) (c)(d)	77,051		76,000
J.P. Morgan Securities, Inc. at:
5.35%, dated 4/30/07 due 5/1/07 (Collateralized by Corporate Obligations valued at $310,083,676, 4.38% - 7.38%, 11/30/07 - 12/1/49)	304,045		304,000
Repurchase Agreements - continued
	Maturity Amount (000s)		Value (000s)
With: - continued
J.P. Morgan Securities, Inc. at:
5.41%, dated 3/22/07 due 5/10/07 (Collateralized by Corporate Obligations valued at $59,220,139, 7.11% - 8.75%, 12/29/10 - 3/18/13) (c)(d)	$ 56,412		$ 56,000
Lehman Brothers, Inc. at:
5.32%, dated 4/30/07 due 7/30/07 (Collateralized by Mortgage Loan Obligations valued at $23,104,299, 2.26% - 7%, 12/25/35 - 7/25/46)	22,296		22,000
5.36%, dated 4/30/07 due 7/30/07 (Collateralized by Mortgage Loan Obligations valued at $15,752,352, 4.73% - 16.32%, 4/25/34 - 12/15/37)	15,203		15,000
5.4%, dated 3/15/07 due 9/13/07 (Collateralized by Corporate Obligations valued at $19,954,895, 5.87% - 12.5%, 7/26/07 - 6/15/31) (c)(d)	19,519		19,000
Merrill Lynch, Pierce, Fenner & Smith At:
5.36%, dated 4/30/07 due 5/1/07 (Collateralized by Corporate Obligations valued at $202,980,285, 5.3% - 7.5%, 11/15/13 - 3/15/37)	199,030		199,000
5.42%, dated 4/17/07 due 7/17/07 (Collateralized by Corporate Obligations valued at $45,240,421, 0% - 15.16%, 5/15/07 - 10/15/14) (c)(d)	43,589		43,000
Morgan Stanley & Co. at 5.36%, dated 3/22/07 due 5/10/07 (Collateralized by Mortgage Loan Obligations valued at $59,439,068, 0% - 6%, 2/25/08 - 10/15/48)	56,409		56,000
Wachovia Securities, Inc. at 5.38%, dated 4/30/07 due 5/1/07 (Collateralized by Mortgage Loan Obligations valued at $225,420,001, 5.34% - 5.48%, 12/15/43 - 4/15/47)	221,033		221,000
TOTAL REPURCHASE AGREEMENTS		1,970,499
TOTAL INVESTMENT PORTFOLIO - 100.0% (Cost $7,259,271)			7,259,271
NET OTHER ASSETS - 0.0%			142
NET ASSETS - 100%		$ 7,259,413

Security Type Abbreviation

VRDN - VARIABLE RATE DEMAND NOTE

Legend

(a) Yield represents either the annualized yield at the date of purchase, or the stated coupon rate, or, for floating rate securities, the rate at period end.

(b) Security exempt from registration under Rule 144A of the Securities Act of 1933. These securities may be resold in transactions exempt from registration, normally to qualified institutional buyers. At the end of the period, the value of these securities amounted to $1,306,884,000 or 18.0% of net assets.

(c) Coupon rates for floating and adjustable rate securities reflect the rates in effect at period end. Due dates for these security types are the next interest rate reset date or, when applicable, the final maturity date.

(d) The maturity amount is based on the rate at period end.

(e) Restricted securities - Investment in securities not registered under the Securities Act of 1933 (excluding 144A issues). At the end of the period, the value of restricted securities (excluding 144A issues) amounted to $478,000,000 or 6.6% of net assets.

Additional information on each holding is as follows:

Security	Acquisition Date	Cost (000s)
Asset Funding Co. III LLC: 5.38%, 5/8/07	11/7/06	$ 33,000
5.39%, 5/8/07	8/29/06	$ 39,000
Countrywide Commercial Re Fin, Inc. 5.46%, 5/1/07	4/20/07	$ 44,000
Security	Acquisition Date	Cost (000s)
Goldman Sachs Group, Inc. 5.41%, 5/30/07	8/26/04	$ 55,000
ING USA Annuity & Life Insurance Co. 5.44%, 6/25/07	6/23/05	$ 11,000
Jackson National Life Insurance Co. 5.40%, 7/1/07	3/31/03	$ 34,000
Lehman Brothers Holdings, Inc.: 5.43%, 5/11/07	1/10/07	$ 19,000
5.46%, 8/28/07	12/11/06	$ 8,000
Lehman Commercial Paper, Inc. 5.46%, 5/1/07	3/29/07	$ 28,000
Metropolitan Life Insurance Co. 5.45%, 7/2/07	3/26/02	$ 25,000
Monumental Life Insurance Co.: 5.46%, 5/1/07	7/31/98 - 9/17/98	$ 29,000
5.56%, 5/1/07	2/1/00	$ 35,000
New York Life Insurance Co. 5.43%, 6/30/07	2/28/02	$ 60,000
Security Life of Denver Insurance Co. 5.45%, 5/29/07	8/26/05	$ 8,000
Transamerica Occidental Life Insurance Co. 5.53%, 5/1/07	4/28/00	$ 50,000

# Additional Information on each counterparty to the repurchase agreement is as follows:

Repurchase Agreement / Counterparty	Value (Amounts in thousands)
$499,000 due 5/01/07 at 5.27%
Bank of America, NA	$ 118
Bear Stearns & Co., Inc.	157
Credit Suisse Securities (USA) LLC	39
HSBC Securities (USA), Inc.	28
Societe Generale, New York Branch	157
	$ 499

Income Tax Information

At April 30, 2007, the fund had a capital loss carryforward of approximately $801,000 of which $2,000, $96,000, $402,000, $242,000 and $59,000 will expire on April 30, 2008, 2012, 2013, 2014 and 2015, respectively.

See accompanying notes which are an integral part of the financial statements.

Annual Report

Financial Statements

Statement of Assets and Liabilities

Amounts in thousands (except per-share amount)	April 30, 2007

Assets
Investment in securities, at value (including repurchase agreements of $1,970,499) - See accompanying schedule: Unaffiliated issuers (cost $7,259,271)		$ 7,259,271
Cash		936
Receivable for investments sold		11,138
Receivable for fund shares sold		33,912
Interest receivable		35,625
Other receivables		136
Total assets		7,341,018

Liabilities
Payable for investments purchased	$ 55,212
Payable for fund shares redeemed	21,740
Distributions payable	1,940
Accrued management fee	2,553
Other affiliated payables	23
Other payables and accrued expenses	137
Total liabilities		81,605

Net Assets		$ 7,259,413
Net Assets consist of:
Paid in capital		$ 7,260,100
Distributions in excess of net investment income		(160)
Accumulated undistributed net realized gain (loss) on investments		(527)
Net Assets, for 7,259,908 shares outstanding		$ 7,259,413
Net Asset Value, offering price and redemption price per share ($7,259,413 ÷ 7,259,908 shares)		$ 1.00

See accompanying notes which are an integral part of the financial statements.

Annual Report

Financial Statements - continued

Statement of Operations

Amounts in thousands	Year ended April 30, 2007

Investment Income
Interest (including $157 from affiliated interfund lending)		$ 358,431

Expenses
Management fee	$ 28,030
Independent trustees' compensation	23
Appreciation in deferred trustee compensation account	2
Interest	81
Total expenses before reductions	28,136
Expense reductions	(239)	27,897
Net investment income		330,534
Realized and Unrealized Gain (Loss) Net realized gain (loss) on:
Investment securities:
Unaffiliated issuers		(223)
Net increase in net assets resulting from operations		$ 330,311

See accompanying notes which are an integral part of the financial statements.

Annual Report

Statement of Changes in Net Assets

Amounts in thousands	Year ended April 30, 2007	Year ended April 30, 2006
Increase (Decrease) in Net Assets
Operations
Net investment income	$ 330,534	$ 208,349
Net realized gain (loss)	(223)	29
Net increase in net assets resulting from operations	330,311	208,378
Distributions to shareholders from net investment income	(330,442)	(208,416)
Share transactions at net asset value of $1.00 per share Proceeds from sales of shares	8,342,462	4,049,087
Reinvestment of distributions	309,915	198,090
Cost of shares redeemed	(6,861,940)	(4,343,515)
Net increase (decrease) in net assets and shares resulting from share transactions	1,790,437	(96,338)
Total increase (decrease) in net assets	1,790,306	(96,376)

Net Assets
Beginning of period	5,469,107	5,565,483
End of period (including distributions in excess of net investment income of $160 and distributions in excess of net investment income of $167, respectively)	$ 7,259,413	$ 5,469,107

See accompanying notes which are an integral part of the financial statements.

Annual Report

Financial Highlights

Years ended April 30,	2007	2006	2005	2004	2003
Selected Per-Share Data
Net asset value, beginning of period	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00
Income from Investment Operations
Net investment income	.049	.036	.015	.008	.013
Distributions from net investment income	(.049)	(.036)	(.015)	(.008)	(.013)
Net asset value, end of period	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00
Total Return^{A, B}	5.06%	3.64%	1.54%	.81%	1.35%
Ratios to Average Net Assets^C
Expenses before reductions	.42%	.42%	.42%	.42%	.42%
Expenses net of fee waivers, if any	.42%	.42%	.42%	.42%	.42%
Expenses net of all reductions	.42%	.42%	.42%	.42%	.42%
Net investment income	4.95%	3.59%	1.52%	.81%	1.35%
Supplemental Data
Net assets, end of period (in millions)	$ 7,259	$ 5,469	$ 5,565	$ 5,673	$ 7,063

^A Total returns would have been lower had certain expenses not been reduced during the periods shown.

^B Total returns do not include the effect of the account closeout fee.

^C Expense ratios reflect operating expenses of the Fund. Expenses before reductions do not reflect amounts reimbursed by the investment adviser or expense offset arrangements and do not represent the amount paid by the Fund during periods when reimbursements or reductions occur. Expenses net of fee waivers reflect expenses after reimbursement by the investment adviser but prior to reductions from expense offset arrangements. Expenses net of all reductions represent the net expenses paid by the Fund.

See accompanying notes which are an integral part of the financial statements.

Annual Report

Notes to Financial Statements

For the period ended April 30, 2007

(Amounts in thousands except ratios)

1. Organization.

Fidelity Money Market Fund (the Fund) is a fund of Fidelity Hereford Street Trust (the trust) and is authorized to issue an unlimited number of shares. The trust is registered under the Investment Company Act of 1940, as amended (the 1940 Act), as an open-end management investment company organized as a Delaware statutory trust. The financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America, which require management to make certain estimates and assumptions at the date of the financial statements.

2. Significant Accounting Policies.

The following summarizes the significant accounting policies of the Fund:

Security Valuation. Net asset value per share is calculated as of the close of business of the New York Stock Exchange, normally 4:00 p.m. Eastern time. As permitted by compliance with certain conditions under Rule 2a-7 of the 1940 Act, securities are valued at amortized cost, which approximates value.

Investment Transactions and Income. Security transactions are accounted for as of trade date. Gains and losses on securities sold are determined on the basis of identified cost. Interest income is accrued as earned. Interest income includes coupon interest and amortization of premium and accretion of discount on debt securities.

Expenses. Most expenses of the trust can be directly attributed to a fund. Expenses which cannot be directly attributed are apportioned among each Fund in the trust. Expense estimates are accrued in the period to which they relate and adjustments are made when actual amounts are known.

Deferred Trustee Compensation. Under a Deferred Compensation Plan (the Plan), Independent Trustees must defer receipt of a portion of, and may elect to defer receipt of an additional portion of, their annual compensation. Deferred amounts are invested in a cross-section of Fidelity funds, are marked-to-market and remain in the Fund until distributed in accordance with the Plan. The investment of deferred amounts and the offsetting payable to the Trustees are included in the accompanying Statement of Assets and Liabilities.

Income Tax Information and Distributions to Shareholders. Each year, the Fund intends to qualify as a regulated investment company by distributing all of its taxable income and realized gains under Subchapter M of the Internal Revenue Code. As a result, no provision for income taxes is required in the accompanying financial statements.

Dividends are declared daily and paid monthly from net investment income. Distributions from realized gains, if any, are recorded on the ex-dividend date. Income and capital gain distributions are determined in accordance with income tax regulations,

Annual Report

Notes to Financial Statements - continued

(Amounts in thousands except ratios)

2. Significant Accounting Policies - continued

Income Tax Information and Distributions to Shareholders - continued

which may differ from generally accepted accounting principles. In addition, the Fund will claim a portion of the payment made to redeeming shareholders as a distribution for income tax purposes.

Capital accounts within the financial statements are adjusted for permanent book-tax differences. These adjustments have no impact on net assets or the results of operations. Temporary book-tax differences will reverse in a subsequent period.

Book-tax differences are primarily due to deferred trustees compensation, capital loss carryforwards, losses deferred due to wash sales and excise tax regulations.

The tax-basis components of distributable earnings and the federal tax cost as of period end were as follows:

Unrealized appreciation	$ -
Unrealized depreciation	-
Net unrealized appreciation (depreciation)	-
Undistributed ordinary income	438
Capital loss carryforward	(801)

Cost for federal income tax purposes	$ 7,259,271

The tax character of distributions paid was as follows:

	April 30, 2007	April 30, 2006
Ordinary Income	$ 330,442	$ 208,416

New Accounting Pronouncements. In July 2006, Financial Accounting Standards Board Interpretation No. 48, Accounting for Uncertainty in Income Taxes - an interpretation of FASB Statement 109 (FIN 48), was issued and is effective on the last business day of the semiannual reporting period for fiscal years beginning after December 15, 2006. FIN 48 sets forth a threshold for financial statement recognition, measurement and disclosure of a tax position taken or expected to be taken on a tax return. Management is currently evaluating the impact, if any, the adoption of FIN 48 will have on the Fund's net assets, results of operations and financial statement disclosures.

In addition, in September 2006, Statement of Financial Accounting Standards No. 157, Fair Value Measurements (SFAS 157), was issued and is effective for fiscal years beginning after November 15, 2007. SFAS 157 defines fair value, establishes a framework for measuring fair value and expands disclosures about fair value measurements. Management is currently evaluating the impact the adoption of SFAS 157 will have on the Fund's financial statement disclosures.

Annual Report

3. Operating Policies.

Repurchase Agreements. Fidelity Management & Research Company (FMR) has received an Exemptive Order from the Securities and Exchange Commission (the SEC) which permits the Fund and other affiliated entities of FMR to transfer uninvested cash balances into joint trading accounts which are then invested in repurchase agreements. The Fund may also invest directly with institutions in repurchase agreements. Repurchase agreements are collateralized by government or non-government securities. Upon settlement date, collateral is held in segregated accounts with custodian banks and may be obtained in the event of a default of the counterparty. The Fund monitors, on a daily basis, the value of the collateral to ensure it is at least equal to the principal amount of the repurchase agreement (including accrued interest). In the event of a default by the counterparty, realization of the collateral proceeds could be delayed, during which time the value of the collateral may decline.

Reverse Repurchase Agreements. To enhance its yield, the Fund may enter into reverse repurchase agreements whereby the Fund transfers securities to a counterparty who then agrees to transfer them back to the Fund at a future date and agreed upon price, reflecting a rate of interest below market rate. The Fund receives cash proceeds, which are invested in other securities, and agrees to repay the proceeds plus accrued interest in return for the same securities transferred. The Fund continues to receive interest payments on the transferred securities during the term of the reverse repurchase agreement. During the period that a reverse repurchase agreement is outstanding, the Fund identifies cash and liquid securities as segregated in its custodian records with a value at least equal to its obligation under the agreement. If the counterparty defaults on its obligation, because of insolvency or other reasons, the Fund could experience delays and costs in recovering the security or in gaining access to the collateral. The average daily balance during the period for which reverse repurchase agreements were outstanding amounted to $37,635. The weighted average interest rate was 4.31%. At period end, there were no reverse repurchase agreements outstanding.

Restricted Securities. The Fund may invest in securities that are subject to legal or contractual restrictions on resale. These securities generally may be resold in transactions exempt from registration or to the public if the securities are registered. Disposal of these securities may involve time-consuming negotiations and expense, and prompt sale at an acceptable price may be difficult. Information regarding restricted securities is included at the end of the Fund's Schedule of Investments.

4. Fees and Other Transactions with Affiliates.

Management Fee. FMR and its affiliates provide the Fund with investment management related services for which the Fund pays a monthly management fee that is based

Annual Report

Notes to Financial Statements - continued

(Amounts in thousands except ratios)

4. Fees and Other Transactions with Affiliates - continued

Management Fee - continued

on an annual rate of .42% of the Fund's average net assets. FMR pays all other expenses, except the compensation of the independent Trustees and certain exceptions such as interest expense, including commitment fees. The management fee paid to FMR by the Fund is reduced by an amount equal to the fees and expenses paid by the Fund to the independent Trustees.

FMR also bears the cost of providing shareholder services to the Fund. To offset the cost of providing these services, FMR or its affiliates collected certain transaction fees from shareholders which amounted to $99 for the period.

Interfund Lending Program. Pursuant to an Exemptive Order issued by the SEC, the Fund, along with other registered investment companies having management contracts with FMR, may participate in an interfund lending program. This program provides an alternative credit facility allowing the funds to borrow from, or lend money to, other participating affiliated funds. At period end, there were no interfund loans outstanding. The Fund's activity in this program during the period for which loans were outstanding was as follows:

Borrower or Lender	Average Daily Loan Balance	Weighted Average Interest Rate
Lender	$ 20,046	5.24%

5. Expense Reductions.

Through arrangements with the Fund's custodian and transfer agent, credits realized as a result of uninvested cash balances were used to reduce the Fund's management fee. During the period, these credits reduced the Fund's management fee by $239.

6. Other.

The Fund's organizational documents provide former and current trustees and officers with a limited indemnification against liabilities arising in connection with the performance of their duties to the Fund. In the normal course of business, the Fund may also enter into contracts that provide general indemnifications. The Fund's maximum exposure under these arrangements is unknown as this would be dependent on future claims that may be made against the Fund. The risk of material loss from such claims is considered remote.

Annual Report

Report of Independent Registered Public Accounting Firm

To the Trustees of Fidelity Hereford Street Trust and the Shareholders of Fidelity Money Market Fund:

In our opinion, the accompanying statement of assets and liabilities, including the schedule of investments, and the related statements of operations and of changes in net assets and the financial highlights present fairly, in all material respects, the financial position of Fidelity Money Market Fund (a fund of Fidelity Hereford Street Trust) at April 30, 2007, the results of its operations for the year then ended, the changes in its net assets for each of the two years in the period then ended and the financial highlights for each of the five years in the period then ended, in conformity with accounting principles generally accepted in the United States of America. These financial statements and financial highlights (hereafter referred to as "financial statements") are the responsibility of the Fidelity Money Market Fund's management. Our responsibility is to express an opinion on these financial statements based on our audits. We conducted our audits of these financial statements in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the accounting principles used and significant estimates made by management, and evaluating the overall financial statement presentation. We believe that our audits, which included confirmation of securities at April 30, 2007 by correspondence with the custodian and brokers, provide a reasonable basis for our opinion.

/s/ PricewaterhouseCoopers LLP

PricewaterhouseCoopers LLP

Boston, Massachusetts

June 13, 2007

Annual Report

Trustees and Officers

The Trustees, Member of the Advisory Board, and executive officers of the trust and fund, as applicable, are listed below. The Board of Trustees governs the fund and is responsible for protecting the interests of shareholders. The Trustees are experienced executives who meet periodically throughout the year to oversee the fund's activities, review contractual arrangements with companies that provide services to the fund, and review the fund's performance. Except for James C. Curvey, each of the Trustees oversees 353 funds advised by FMR or an affiliate. Mr. Curvey oversees 314 funds advised by FMR or an affiliate.

The Trustees hold office without limit in time except that (a) any Trustee may resign; (b) any Trustee may be removed by written instrument, signed by at least two-thirds of the number of Trustees prior to such removal; (c) any Trustee who requests to be retired or who has become incapacitated by illness or injury may be retired by written instrument signed by a majority of the other Trustees; and (d) any Trustee may be removed at any special meeting of shareholders by a two-thirds vote of the outstanding voting securities of the trust. Each Trustee who is not an interested person (as defined in the 1940 Act) (Independent Trustee), shall retire not later than the last day of the calendar year in which his or her 72nd birthday occurs. The Independent Trustees may waive this mandatory retirement age policy with respect to individual Trustees. The executive officers and Advisory Board Member hold office without limit in time, except that any officer and Advisory Board Member may resign or may be removed by a vote of a majority of the Trustees at any regular meeting or any special meeting of the Trustees. Except as indicated, each individual has held the office shown or other offices in the same company for the past five years.

The fund's Statement of Additional Information (SAI) includes more information about the Trustees. To request a free copy, call Fidelity at 1-800-544-8544.

Interested Trustees*:

Correspondence intended for each Trustee who is an interested person may be sent to Fidelity Investments, 82 Devonshire Street, Boston, Massachusetts 02109.

Name, Age; Principal Occupation
Edward C. Johnson 3d (76)
	Year of Election or Appointment: 1993 Mr. Johnson is Chairman of the Board of Trustees. Mr. Johnson serves as President (2006-present), Chief Executive Officer, Chairman, and a Director of FMR Corp.; Chairman and a Director of FMR; Chairman and a Director of Fidelity Research & Analysis Company (FRAC); Chairman and a Director of Fidelity Investments Money Management, Inc.; and Chairman (2001-present) and a Director of FMR Co., Inc. In addition, Mr. Johnson serves as Chairman and Director of Fidelity International Limited (FIL).
James C. Curvey (71)
	Year of Election or Appointment: 2007 Mr. Curvey is Vice Chairman (2006-present) and Director of FMR Corp. Mr. Curvey joined Fidelity in 1982 and served in numerous senior management positions, including President and Chief Operating Officer of FMR Corp. (1997-2000) and President of Fidelity Strategic Investments (2000-2002). In addition, he serves as a member of the Board of Directors of Geerlings & Wade, Inc. (wine distribution).

* Trustees have been determined to be "Interested Trustees" by virtue of, among other things, their affiliation with the trust or various entities under common control with FMR.

Independent Trustees:

Correspondence intended for each Independent Trustee (that is, the Trustees other than the Interested Trustees) may be sent to Fidelity Investments, P.O. Box 55235, Boston, Massachusetts 02205-5235.

Name, Age; Principal Occupation
Dennis J. Dirks (58)
	Year of Election or Appointment: 2005 Prior to his retirement in May 2003, Mr. Dirks was Chief Operating Officer and a member of the Board of The Depository Trust & Clearing Corporation (DTCC) (1999-2003). He also served as President, Chief Operating Officer, and Board member of The Depository Trust Company (DTC) (1999-2003) and President and Board member of the National Securities Clearing Corporation (NSCC) (1999-2003). In addition, Mr. Dirks served as Chief Executive Officer and Board member of the Government Securities Clearing Corporation (2001-2003) and Chief Executive Officer and Board member of the Mortgage-Backed Securities Clearing Corporation (2001-2003). Mr. Dirks also serves as a Trustee and a member of the Finance Committee of Manhattan College (2005-present) and a Trustee and a member of the Finance Committee of AHRC of Nassau County (2006-present).
Albert R. Gamper, Jr. (65)
	Year of Election or Appointment: 2006 Prior to his retirement in December 2004, Mr. Gamper served as Chairman of the Board of CIT Group Inc. (commercial finance). During his tenure with CIT Group Inc. Mr. Gamper served in numerous senior management positions, including Chairman (1987-1989; 1999-2001; 2002-2004), Chief Executive Officer (1987-2004), and President (1989-2002). He currently serves as a member of the Board of Directors of Public Service Enterprise Group (utilities, 2001-present), Chairman of the Board of Governors, Rutgers University (2004-present), and Chairman of the Board of Saint Barnabas Health Care System.
George H. Heilmeier (70)
	Year of Election or Appointment: 2004 Dr. Heilmeier is Chairman Emeritus of Telcordia Technologies (communication software and systems), where prior to his retirement, he served as company Chairman and Chief Executive Officer. He currently serves on the Boards of Directors of The Mitre Corporation (systems engineering and information technology support for the government), and HRL Laboratories (private research and development, 2004-present). He is Chairman of the General Motors Science & Technology Advisory Board and a Life Fellow of the Institute of Electrical and Electronics Engineers (IEEE). Dr. Heilmeier is a member of the Defense Science Board and the National Security Agency Advisory Board. He is also a member of the National Academy of Engineering, the American Academy of Arts and Sciences, and the Board of Overseers of the School of Engineering and Applied Science of the University of Pennsylvania. Previously, Dr. Heilmeier served as a Director of TRW Inc. (automotive, space, defense, and information technology, 1992-2002), Compaq (1994-2002), Automatic Data Processing, Inc. (ADP) (technology-based business outsourcing, 1995-2002), INET Technologies Inc. (telecommunications network surveillance, 2001-2004), and Teletech Holdings (customer management services). He is the recipient of the 2005 Kyoto Prize in Advanced Technology for his invention of the liquid crystal display, and a member of the Consumer Electronics Hall of Fame.
James H. Keyes (66)
	Year of Election or Appointment: 2007 Prior to his retirement in 2003, Mr. Keyes was Chairman, President, and Chief Executive Officer of Johnson Controls, Inc. (automotive supplier, 1993-2003). He currently serves as a member of the boards of LSI Logic Corporation (semiconductor technologies), Navistar International Corporation (manufacture and sale of trucks, buses, and diesel engines, 2002-present), and Pitney Bowes, Inc. (integrated mail, messaging, and document management solutions).
Marie L. Knowles (60)
	Year of Election or Appointment: 2001 Prior to Ms. Knowles' retirement in June 2000, she served as Executive Vice President and Chief Financial Officer of Atlantic Richfield Company (ARCO) (diversified energy, 1996-2000). From 1993 to 1996, she was a Senior Vice President of ARCO and President of ARCO Transportation Company. She served as a Director of ARCO from 1996 to 1998. She currently serves as a Director of Phelps Dodge Corporation (copper mining and manufacturing) and McKesson Corporation (healthcare service, 2002-present). Ms. Knowles is a Trustee of the Brookings Institution and the Catalina Island Conservancy and also serves as a member of the Advisory Board for the School of Engineering of the University of Southern California.
Ned C. Lautenbach (63)
	Year of Election or Appointment: 2000 Mr. Lautenbach is Chairman of the Independent Trustees (2006-present). Mr. Lautenbach has been a partner of Clayton, Dubilier & Rice, Inc. (private equity investment firm) since September 1998. Previously, Mr. Lautenbach was with the International Business Machines Corporation (IBM) from 1968 until his retirement in 1998. Mr. Lautenbach serves as a Director of Sony Corporation (2006-present) and Eaton Corporation (diversified industrial) as well as the Philharmonic Center for the Arts in Naples, Florida. He also is a member of the Board of Trustees of Fairfield University (2005-present), as well as a member of the Council on Foreign Relations.
Cornelia M. Small (62)
	Year of Election or Appointment: 2005 Ms. Small is a member (2000-present) and Chairperson (2002-present) of the Investment Committee, and a member (2002-present) of the Board of Trustees of Smith College. Previously, she served as Chief Investment Officer (1999-2000), Director of Global Equity Investments (1996-1999), and a member of the Board of Directors of Scudder, Stevens & Clark (1990-1997) and Scudder Kemper Investments (1997-1999). In addition, Ms. Small served as Co-Chair (2000-2003) of the Annual Fund for the Fletcher School of Law and Diplomacy.
William S. Stavropoulos (67)
	Year of Election or Appointment: 2002 Mr. Stavropoulos is Chairman Emeritus of the Board of Directors of The Dow Chemical Company. Since joining The Dow Chemical Company in 1967, Mr. Stavropoulos served in numerous senior management positions, including President (1993-2000; 2002-2003), CEO (1995-2000; 2002-2004), and Chairman of the Executive Committee (2000-2004). Currently, he is a Director of NCR Corporation (data warehousing and technology solutions), Chemical Financial Corporation, Maersk Inc. (industrial conglomerate, 2002-present), Tyco International, Inc. (multinational manufacturing and services, 2007-present), and a member of the Advisory Board for Metalmark Capital (private equity investment firm, 2005-present). He is a special advisor to Clayton, Dubilier & Rice, Inc., a private equity investment firm. He also serves as a member of the Board of Trustees of the American Enterprise Institute for Public Policy Research. In addition, Mr. Stavropoulos is a member of The Business Council, J.P. Morgan International Council and the University of Notre Dame Advisory Council for the College of Science.
Kenneth L. Wolfe (68)
	Year of Election or Appointment: 2005 Prior to his retirement in 2001, Mr. Wolfe was Chairman and Chief Executive Officer of Hershey Foods Corporation (1993-2001). He currently serves as a member of the boards of Adelphia Communications Corporation (2003-present), Bausch & Lomb, Inc., and Revlon Inc. (2004-present).

Advisory Board Member and Executive Officers:

Correspondence intended for each executive officer and Mr. Lynch may be sent to Fidelity Investments, 82 Devonshire Street, Boston, Massachusetts 02109.

Name, Age; Principal Occupation
Peter S. Lynch (63)
	Year of Election or Appointment: 2003 Member of the Advisory Board of Fidelity Hereford Street Trust. Mr. Lynch is Vice Chairman and a Director of FMR, and Vice Chairman (2001-present) and a Director of FMR Co., Inc. Previously, Mr. Lynch served as a Trustee of the Fidelity funds (1990-2003). In addition, he serves as a Trustee of Boston College and as the Chairman of the Inner-City Scholarship Fund.
Kimberley H. Monasterio (43)
	Year of Election or Appointment: 2007 President and Treasurer of Money Market. Ms. Monasterio also serves as President and Treasurer of other Fidelity funds (2007-present) and is an employee of FMR (2004-present). Previously, Ms. Monasterio served as Deputy Treasurer of the Fidelity funds (2004-2006). Before joining Fidelity Investments, Ms. Monasterio served as Treasurer (2000-2004) and Chief Financial Officer (2002-2004) of the Franklin Templeton Funds and Senior Vice President of Franklin Templeton Services, LLC (2000-2004).
Boyce I. Greer (51)
	Year of Election or Appointment: 2006 Vice President of Money Market. Mr. Greer also serves as Vice President of certain Equity Funds (2005-present), certain Asset Allocation Funds (2005-present), Fixed-Income Funds (2006-present), and Money Market Funds (2006-present). Mr. Greer is also a Trustee of other investment companies advised by FMR (2003-present). He is an Executive Vice President of FMR (2005-present) and FMR Co., Inc. (2005-present), and Senior Vice President of Fidelity Investments Money Management, Inc. (2006-present). Previously, Mr. Greer served as a Director and Managing Director of Strategic Advisers, Inc. (2002-2005), and Executive Vice President (2000-2002) and Money Market Group Leader (1997-2002) of the Fidelity Investments Fixed Income Division. He also served as Vice President of Fidelity's Money Market Funds (1997-2002), Senior Vice President of FMR (1997-2002), and Vice President of FIMM (1998-2002).
Charles S. Morrison (46)
	Year of Election or Appointment: 2005 Vice President of Money Market. Mr. Morrison also serves as Vice President of Fidelity's Money Market Funds (2005-present) and certain Asset Allocation Funds (2002-present). Previously, he served as Vice President of Fidelity's Bond Funds (2002-2005) and certain Balanced Funds (2002-2005). He served as Vice President (2002-2005) and Bond Group Leader (2002-2005) of Fidelity Investments Fixed Income Division. Mr. Morrison is also Vice President of FIMM (2002-present) and FMR (2002-present). Mr. Morrison joined Fidelity Investments in 1987 as a Corporate Bond Analyst in the Fixed Income Research Division.
David L. Murphy (59)
	Year of Election or Appointment: 2002 Vice President of Money Market. Mr. Murphy also serves as Vice President of Fidelity's Money Market Funds (2002-present), certain Asset Allocation Funds (2003-present), Fixed-Income Funds (2005-present), and Balanced Funds (2005-present). He serves as Senior Vice President (2000-present) and Head (2004-present) of the Fidelity Investments Fixed Income Division. Mr. Murphy is also a Senior Vice President of Fidelity Investments Money Management, Inc. (2003-present) and an Executive Vice President of FMR (2005-present). Previously, Mr. Murphy served as Money Market Group Leader (2002-2004), Bond Group Leader (2000-2002), and Vice President of Fidelity's Taxable Bond Funds (2000-2002) and Fidelity's Municipal Bond Funds (2001-2002).
Kenneth J. Anderson (42)
	Year of Election or Appointment: 2004 Vice President of Money Market. Mr. Anderson also serves as Vice President of other funds advised by FMR. Prior to assuming his current responsibilities, Mr. Anderson worked as a trader, research analyst and portfolio manager.
Eric D. Roiter (58)
	Year of Election or Appointment: 1998 Secretary of Money Market. He also serves as Secretary of other Fidelity funds; Vice President, General Counsel, and Secretary of FMR Co., Inc. (2001-present) and FMR; Assistant Secretary of Fidelity Management & Research (U.K.) Inc. (2001-present), Fidelity Research & Analysis Company (2001-present), and Fidelity Investments Money Management, Inc. (2001-present). Mr. Roiter is an Adjunct Member, Faculty of Law, at Boston College Law School (2003-present). Previously, Mr. Roiter served as Vice President and Secretary of Fidelity Distributors Corporation (FDC) (1998-2005).
Scott C. Goebel (39)
	Year of Election or Appointment: 2007 Assistant Secretary of Money Market. Mr. Goebel also serves as Assistant Secretary of other Fidelity funds (2007-present), Vice President and Secretary of FDC (2006-present), and is an employee of FMR.
R. Stephen Ganis (41)
	Year of Election or Appointment: 2006 Anti-Money Laundering (AML) officer of Money Market. Mr. Ganis also serves as AML officer of other Fidelity funds (2006-present) and FMR Corp. (2003-present). Before joining Fidelity Investments, Mr. Ganis practiced law at Goodwin Procter, LLP (2000-2002).
Joseph B. Hollis (59)
	Year of Election or Appointment: 2006 Chief Financial Officer of Money Market. Mr. Hollis also serves as Chief Financial Officer of other Fidelity funds. Mr. Hollis is President of Fidelity Pricing and Cash Management Services (FPCMS) (2005-present). Mr. Hollis also serves as President and Director of Fidelity Service Company, Inc. (2006-present). Previously, Mr. Hollis served as Senior Vice President of Cash Management Services (1999-2002) and Investment Management Operations (2002-2005).
Kenneth A. Rathgeber (59)
	Year of Election or Appointment: 2004 Chief Compliance Officer of Money Market. Mr. Rathgeber also serves as Chief Compliance Officer of other Fidelity funds (2004-present) and Executive Vice President of Risk Oversight for Fidelity Investments (2002-present). He is Chief Compliance Officer of FMR (2005-present), FMR Co., Inc. (2005-present), Fidelity Management & Research (U.K.) Inc. (2005-present), Fidelity Research & Analysis Company (2005-present), Fidelity Investments Money Management, Inc. (2005-present), and Strategic Advisers, Inc. (2005-present). Previously, Mr. Rathgeber served as Executive Vice President and Chief Operating Officer for Fidelity Investments Institutional Services Company, Inc. (1998-2002).
Bryan A. Mehrmann (46)
	Year of Election or Appointment: 2005 Deputy Treasurer of Money Market. Mr. Mehrmann also serves as Deputy Treasurer of other Fidelity funds (2005-present) and is an employee of FMR. Previously, Mr. Mehrmann served as Vice President of Fidelity Investments Institutional Services Group (FIIS)/Fidelity Investments Institutional Operations Corporation, Inc. (FIIOC) Client Services (1998-2004).
Kenneth B. Robins (37)
	Year of Election or Appointment: 2005 Deputy Treasurer of Money Market. Mr. Robins also serves as Deputy Treasurer of other Fidelity funds (2005-present) and is an employee of FMR (2004-present). Before joining Fidelity Investments, Mr. Robins worked at KPMG LLP, where he was a partner in KPMG's department of professional practice (2002-2004) and a Senior Manager (1999-2000). In addition, Mr. Robins served as Assistant Chief Accountant, United States Securities and Exchange Commission (2000-2002).
Robert G. Byrnes (40)
	Year of Election or Appointment: 2005 Assistant Treasurer of Money Market. Mr. Byrnes also serves as Assistant Treasurer of other Fidelity funds (2005-present) and is an employee of FMR (2005-present). Previously, Mr. Byrnes served as Vice President of FPCMS (2003-2005). Before joining Fidelity Investments, Mr. Byrnes worked at Deutsche Asset Management where he served as Vice President of the Investment Operations Group (2000-2003).
Peter L. Lydecker (53)
	Year of Election or Appointment: 2004 Assistant Treasurer of Money Market. Mr. Lydecker also serves as Assistant Treasurer of other Fidelity funds (2004) and is an employee of FMR.
Gary W. Ryan (48)
	Year of Election or Appointment: 2005 Assistant Treasurer of Money Market. Mr. Ryan also serves as Assistant Treasurer of other Fidelity funds (2005-present) and is an employee of FMR (2005-present). Previously, Mr. Ryan served as Vice President of Fund Reporting in FPCMS (1999-2005).
Salvatore Schiavone (41)
	Year of Election or Appointment: 2005 Assistant Treasurer of Money Market. Mr. Schiavone also serves as Assistant Treasurer of other Fidelity funds (2005-present) and is an employee of FMR (2005-present). Before joining Fidelity Investments, Mr. Schiavone worked at Deutsche Asset Management, where he most recently served as Assistant Treasurer (2003-2005) of the Scudder Funds and Vice President and Head of Fund Reporting (1996-2003).

Annual Report

Distributions

A total of 0.57% of the dividends distributed during the fiscal year was derived from interest on U.S. Government securities which is generally exempt from state income tax.

The fund designates $118,508,052 of distributions paid during the period January 1, 2007 to April 30, 2007 as qualifying to be taxed as interest-related dividends for nonresident alien shareholders.

The fund will notify shareholders in January 2008 of amounts for use in preparing 2007 income tax returns.

Annual Report

Proxy Voting Results

A special meeting of the fund's shareholders was held on November 15, 2006. The results of votes taken among shareholders on the proposal before them are reported below. Each vote reported represents one dollar of net asset value held on the record date for the meeting.

PROPOSAL1
To elect a Board of Trustees. ^A
	# of Votes	% of Votes
Dennis J. Dirks
Affirmative	3,218,948,197.74	96.190
Withheld	127,485,270.73	3.810
TOTAL	3,346,433,468.47	100.000
Albert R. Gamper, Jr.
Affirmative	3,215,354,397.39	96.083
Withheld	131,079,071.08	3.917
TOTAL	3,346,433,468.47	100.000
Robert M. Gates
Affirmative	3,206,365,014.21	95.814
Withheld	140,068,454.26	4.186
TOTAL	3,346,433,468.47	100.000
George H. Heilmeier
Affirmative	3,202,447,547.40	95.697
Withheld	143,985,921.07	4.303
TOTAL	3,346,433,468.47	100.000
Edward C. Johnson 3d
Affirmative	3,193,314,793.06	95.424
Withheld	153,118,675.41	4.576
TOTAL	3,346,433,468.47	100.000
Stephen P. Jonas
Affirmative	3,212,351,847.33	95.993
Withheld	134,081,621.14	4.007
TOTAL	3,346,433,468.47	100.000
James H. Keyes^B
Affirmative	3,215,401,563.53	96.084
Withheld	131,031,904.94	3.916
TOTAL	3,346,433,468.47	100.000
	# of Votes	% of Votes
Marie L. Knowles
Affirmative	3,215,966,891.46	96.101
Withheld	130,466,577.01	3.899
TOTAL	3,346,433,468.47	100.000
Ned C. Lautenbach
Affirmative	3,208,900,601.85	95.890
Withheld	137,532,866.62	4.110
TOTAL	3,346,433,468.47	100.000
William O. McCoy
Affirmative	3,201,902,631.61	95.681
Withheld	144,530,836.86	4.319
TOTAL	3,346,433,468.47	100.000
Robert L. Reynolds
Affirmative	3,217,595,027.12	96.150
Withheld	128,838,441.35	3.850
TOTAL	3,346,433,468.47	100.000
Cornelia M. Small
Affirmative	3,212,941,689.62	96.011
Withheld	133,491,778.85	3.989
TOTAL	3,346,433,468.47	100.000
William S. Stavropoulos
Affirmative	3,212,375,473.68	95.994
Withheld	134,057,994.79	4.006
TOTAL	3,346,433,468.47	100.000
Kenneth L. Wolfe
Affirmative	3,211,985,097.72	95.982
Withheld	134,448,370.75	4.018
TOTAL	3,346,433,468.47	100.000
^A Denotes trust-wide proposal and voting results. ^B Effective on or about January 1, 2007.

Annual Report

Managing Your Investments

Fidelity offers several ways to conveniently manage your personal investments via your telephone or PC. You can access your account information, conduct trades and research your investments 24 hours a day.

By Phone

Fidelity Automated Service Telephone provides a single toll-free number to access account balances, positions, quotes and trading. It's easy to navigate the service, and on your first call, the system will help you create a personal identification number (PIN) for security.

(phone_graphic)

Fidelity Automated
Service Telephone (FAST®)
1-800-544-5555

Press

1 For mutual fund and brokerage trading.

2 For quotes.*

3 For account balances and holdings.

4 To review orders and mutual
fund activity.

5 To change your PIN.

*0 To speak to a Fidelity representative.

By PC

Fidelity's web site on the Internet provides a wide range of information, including daily financial news, fund performance, interactive planning tools and news about Fidelity products and services.

(computer_graphic)

Fidelity's Web Site
www.fidelity.com

* When you call the quotes line, please remember that a fund's yield and return will vary and, except for money market funds, share price will also vary. This means that you may have a gain or loss when you sell your shares. There is no assurance that money market funds will be able to maintain a stable $1 share price; an investment in a money market fund is not insured or guaranteed by the U.S. government. Total returns are historical and include changes in share price, reinvestment of dividends and capital gains, and the effects of any sales charges.

Annual Report

Investment Adviser

Fidelity Management & Research Company

Boston, MA

Investment Sub-Advisers

Fidelity Investments Money
Management, Inc.

Fidelity Research & Analysis Company
(formerly Fidelity Management &
Research (Far East) Inc.)

Fidelity International
Investment Advisors

Fidelity International
Investment Advisors (U.K.) Limited

General Distributor

Fidelity Distributors Corporation

Boston, MA

Transfer and Service Agent

Fidelity Service Company, Inc.

Boston, MA

Custodian

JPMorgan Chase Bank

New York, NY

The Fidelity Telephone Connection

Mutual Fund 24-Hour Service

Exchanges/Redemptions
and Account Assistance 1-800-544-6666

Product Information 1-800-544-6666

Retirement Accounts 1-800-544-4774
(8 a.m. - 9 p.m.)

TDD Service 1-800-544-0118
for the deaf and hearing impaired
(9 a.m. - 9 p.m. Eastern time)

Fidelity Automated Service
Telephone (FAST®) (automated graphic) 1-800-544-5555

(automated graphic) Automated line for quickest service

(Fidelity Investment logo)(registered trademark)
Corporate Headquarters
82 Devonshire St., Boston, MA 02109
www.fidelity.com

SPM-UANN-0607
1.784732.104

Fidelity® Government Money
Market Fund

Annual Report

April 30, 2007

(2_fidelity_logos) (Registered_Trademark)

Chairman's Message	<Click Here>	Ned Johnson's message to shareholders.
Shareholder Expense Example	<Click Here>	An example of shareholder expenses.
Investment Changes/ Performance	<Click Here>	A summary of major shifts in the fund's investments over the past six months and one year.
Investments	<Click Here>	A complete list of the fund's investments.
Financial Statements	<Click Here>	Statements of assets and liabilities, operations, and changes in net assets, as well as financial highlights.
Notes	<Click Here>	Notes to the financial statements.
Report of Independent Registered Public Accounting Firm	<Click Here>
Trustees and Officers	<Click Here>
Distributions	<Click Here>
Proxy Voting Results	<Click Here>

Standard & Poor's, S&P and S&P 500 are registered service marks of The McGraw-Hill Companies, Inc. and have been licensed for use by Fidelity Distributors Corporation.

Other third party marks appearing herein are the property of their respective owners.

All other marks appearing herein are registered or unregistered trademarks or service marks of FMR Corp. or an affiliated company.

NOT FDIC INSURED ·MAY LOSE VALUE ·NO BANK GUARANTEE

Neither the fund nor Fidelity Distributors Corporation is a bank.

Annual Report

Chairman's Message

(photo_of_Edward_C_Johnson_3d)

Dear Shareholder:

Sincerely,

/s/Edward C. Johnson 3d

Edward C. Johnson 3d

Annual Report

Shareholder Expense Example

The Example is based on an investment of $1,000 invested at the beginning of the period and held for the entire period (November 1, 2006 to April 30, 2007).

Actual Expenses

Hypothetical Example for Comparison Purposes

	Beginning Account Value November 1, 2006	Ending Account Value April 30, 2007	Expenses Paid During Period* November 1, 2006 to April 30, 2007
Actual	$ 1,000.00	$ 1,024.60	$ 2.11
Hypothetical (5% return per year before expenses)	$ 1,000.00	$ 1,022.71	$ 2.11

* Expenses are equal to the Fund's annualized expense ratio of .42%; multiplied by the average account value over the period, multiplied by 181/365 (to reflect the one-half year period).

Annual Report

Investment Changes/Performance

Maturity Diversification
Days	% of fund's investments 4/30/07	% of fund's investments 10/31/06	% of fund's investments 4/30/06
0 - 30	78.7	83.0	72.9
31 - 90	6.8	11.8	17.8
91 - 180	5.8	1.8	4.7
181 - 397	8.7	3.4	4.6
Weighted Average Maturity
	4/30/07	10/31/06	4/30/06
Fidelity Government Money Market Fund	37 Days	34 Days	32 Days
Government Retail Money Market Funds Average *	32 Days	36 Days	34 Days

Asset Allocation (% of fund's net assets)
As of April 30, 2007		As of October 31, 2006
	Federal Agency Issues 5.9%		Federal Agency Issues 18.4%
	Repurchase Agreements 93.6%		Repurchase Agreements 81.8%
	Net Other Assets 0.5%		Net Other Assets** (0.2)%

**Net Other Assets are not included in the pie chart.

Current and Historical Seven-Day Yields

	5/1/07	1/30/07	10/31/06	8/1/06	5/2/06
Fidelity Government Money Market Fund	4.85%	4.96%	4.93%	4.90%	4.41%

*Source: iMoneyNet, Inc.

Annual Report

Investments April 30, 2007

Showing Percentage of Net Assets

Federal Agencies - 5.9%
	Due Date	Yield (a)	Principal Amount	Value
Federal Home Loan Bank - 4.5%
	6/25/07 to 3/17/08	5.19 to 5.34% (b)	$ 22,000,000	$ 21,995,194
Freddie Mac - 1.4%
	1/7/08 to 3/14/08	5.25 to 5.32	7,000,000	6,930,403
TOTAL FEDERAL AGENCIES				28,925,597

Repurchase Agreements - 93.6%
	Maturity Amount
In a joint trading account at 5.27% dated 4/30/07 due 5/1/07 (Collateralized by U.S. Government Obligations) #	$ 364,328,309		364,275,000
With:
Barclays Capital, Inc. At 5.29%, dated 11/6/06 due 11/2/07 (Collateralized by Mortgage Loan Obligations valued at $16,320,000, 4.93%, 3/1/35) (b)(c)	16,848,751		16,000,000
CS First Boston Corp. At 5.21%, dated 12/5/06 due 6/5/07 (Collateralized by Mortgage Loan Obligations valued at $3,162,025, 0% - 5.5%, 4/15/12 - 4/1/36)	3,079,018		3,000,000
Deutsche Bank Securities, Inc. At:
5.21%, dated 3/16/07 due 12/17/07 (Collateralized by Mortgage Loan Obligations valued at $7,140,001, 5% - 5.01%, 12/1/34 - 10/1/35)	7,279,603		7,000,000
5.25%, dated 4/13/07 due 4/11/08 (Collateralized by Mortgage Loan Obligations valued at $3,060,000, 6% - 6.7%, 8/1/27 - 6/1/34)	3,159,250		3,000,000
5.26%, dated 12/14/06 due 9/14/07 (Collateralized by Mortgage Loan Obligations valued at $3,060,000, 5.74%, 9/15/36)	3,120,103		3,000,000
5.28%, dated 12/11/06 due 6/11/07 (Collateralized by Mortgage Loan Obligations valued at $5,100,001, 4.5% - 5%, 10/1/19 - 3/1/37)	5,133,340		5,000,000
Morgan Stanley & Co., Inc. At:
5.25%, dated:
4/4/07 due 10/1/07 (Collateralized by Mortgage Loan Obligations valued at $5,123,474, 5.5% - 6.2%, 5/1/34 - 2/1/37)	5,131,250		5,000,000
4/27/07 due 1/22/08 (Collateralized by Mortgage Loan Obligations valued at $5,123,474, 5.5% - 6.2%, 5/1/34 - 2/1/37)	5,196,875		5,000,000
Repurchase Agreements - continued
	Maturity Amount		Value
With: - continued
5.26%, dated 12/15/06 due 9/17/07 (Collateralized by Mortgage Loan Obligations valued at $5,123,474, 5.5% - 6.2%, 5/1/34 - 2/1/37)	$ 5,201,633		$ 5,000,000
5.28%, dated 12/28/06 due 9/28/07 (Collateralized by Mortgage Loan Obligations valued at $5,123,474, 5.5% - 6.2%, 5/1/34 - 2/1/37)	5,200,933		5,000,000
UBS Warburg LLC At:
5.21%, dated 4/4/07 due 12/31/07 (Collateralized by Mortgage Loan Obligations valued at $5,152,834, 5.65%, 3/25/37)	5,196,099		5,000,000
5.25%, dated:
1/10/07 due 1/10/08 (Collateralized by Mortgage Loan Obligations valued at $5,150,100, 5.63%, 3/15/37)	5,266,146		5,000,000
4/4/07 due 10/1/07 (Collateralized by Mortgage Loan Obligations valued at $5,153,260, 5.72%, 3/15/37)	5,131,250		5,000,000
5.26%, dated 3/9/07 due 9/5/07 (Collateralized by Mortgage Loan Obligations valued at $5,150,100, 5.63%, 3/15/37)	5,131,500		5,000,000
5.27%, dated 10/5/06 due 10/3/07 (Collateralized by Mortgage Loan Obligations valued at $10,300,199, 5.63%, 3/15/37) (b)(c)	10,531,392		10,000,000
5.4%, dated 8/30/06 due 6/26/07 (Collateralized by Mortgage Loan Obligations valued at $3,093,048, 5.63%, 3/15/37)	3,135,000		3,000,000
TOTAL REPURCHASE AGREEMENTS		454,275,000
TOTAL INVESTMENT PORTFOLIO - 99.5% (Cost $483,200,597)			483,200,597
NET OTHER ASSETS - 0.5%			2,323,300
NET ASSETS - 100%		$ 485,523,897

Legend

(a) Yield represents either the annualized yield at the date of purchase, or the stated coupon rate, or, for floating rate securities, the rate at period end.

(b) Coupon rates for floating and adjustable rate securities reflect the rates in effect at period end. Due dates for these security types are the next interest rate reset date or, when applicable, the final maturity date.

# Additional Information on each counterparty to the repurchase agreement is as follows:

Repurchase Agreement / Counterparty	Value
$364,275,000 due 5/01/07 at 5.27%
Bank of America, NA	$ 86,013,656
Bear Stearns & Co., Inc.	114,684,874
Credit Suisse Securities (USA) LLC	28,671,219
HSBC Securities (USA), Inc.	20,220,377
Societe Generale, New York Branch	114,684,874
	$ 364,275,000

Income Tax Information

At April 30, 2007, the fund had a capital loss carryforward of approximately $84,291 of which $13,793, $57,321, $2,288 and $10,889 will expire on April 30, 2012, 2013, 2014 and 2015, respectively.

See accompanying notes which are an integral part of the financial statements.

Annual Report

Financial Statements

Statement of Assets and Liabilities

	April 30, 2007

Assets
Investment in securities, at value (including repurchase agreements of $454,275,000) - See accompanying schedule: Unaffiliated issuers (cost $483,200,597)		$ 483,200,597
Receivable for fund shares sold		1,902,979
Interest receivable		1,294,636
Total assets		486,398,212

Liabilities
Payable to custodian bank	$ 232
Payable for fund shares redeemed	597,459
Distributions payable	99,235
Accrued management fee	174,284
Other affiliated payables	3,105
Total liabilities		874,315

Net Assets		$ 485,523,897
Net Assets consist of:
Paid in capital		$ 485,582,832
Undistributed net investment income		25,356
Accumulated undistributed net realized gain (loss) on investments		(84,291)
Net Assets, for 485,547,624 shares outstanding		$ 485,523,897
Net Asset Value, offering price and redemption price per share ($485,523,897 ÷ 485,547,624 shares)		$ 1.00

See accompanying notes which are an integral part of the financial statements.

Annual Report

Financial Statements - continued

Statement of Operations

	Year ended April 30, 2007

Investment Income
Interest		$ 25,505,498

Expenses
Management fee	$ 2,029,853
Independent trustees' compensation	1,785
Interest	12,503
Total expenses before reductions	2,044,141
Expense reductions	(25,819)	2,018,322
Net investment income		23,487,176
Realized and Unrealized Gain (Loss) Net realized gain (loss) on:
Investment securities:
Unaffiliated issuers		(10,889)
Net increase in net assets resulting from operations		$ 23,476,287

See accompanying notes which are an integral part of the financial statements.

Annual Report

Statement of Changes in Net Assets

	Year ended April 30, 2007	Year ended April 30, 2006
Increase (Decrease) in Net Assets
Operations
Net investment income	$ 23,487,176	$ 17,408,520
Net realized gain (loss)	(10,889)	18,194
Net increase in net assets resulting from operations	23,476,287	17,426,714
Distributions to shareholders from net investment income	(23,487,288)	(17,417,142)
Share transactions at net asset value of $1.00 per share Proceeds from sales of shares	392,815,722	268,873,386
Reinvestment of distributions	22,340,028	16,590,635
Cost of shares redeemed	(398,834,332)	(318,514,896)
Net increase (decrease) in net assets and shares resulting from share transactions	16,321,418	(33,050,875)
Total increase (decrease) in net assets	16,310,417	(33,041,303)

Net Assets
Beginning of period	469,213,480	502,254,783
End of period (including undistributed net investment income of $25,356 and undistributed net investment income of $25,468, respectively)	$ 485,523,897	$ 469,213,480

See accompanying notes which are an integral part of the financial statements.

Annual Report

Financial Highlights

Years ended April 30,	2007	2006	2005	2004	2003
Selected Per-Share Data
Net asset value, beginning of period	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00
Income from Investment Operations
Net investment income	.049	.035	.015	.007	.013
Distributions from net investment income	(.049)	(.035)	(.015)	(.007)	(.013)
Net asset value, end of period	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00
Total Return^{A, B}	4.96%	3.56%	1.49%	.75%	1.30%
Ratios to Average Net Assets^C
Expenses before reductions	.42%	.42%	.42%	.42%	.42%
Expenses net of fee waivers, if any	.42%	.42%	.42%	.42%	.42%
Expenses net of all reductions	.42%	.42%	.42%	.42%	.42%
Net investment income	4.86%	3.50%	1.45%	.76%	1.31%
Supplemental Data
Net assets, end of period (000 omitted)	$ 485,524	$ 469,213	$ 502,255	$ 580,152	$ 739,139

^A Total returns would have been lower had certain expenses not been reduced during the periods shown.

^B Total returns do not include the effect of the account closeout fee.

See accompanying notes which are an integral part of the financial statements.

Annual Report

Notes to Financial Statements

For the period ended April 30, 2007

1. Organization.

Fidelity Government Money Market Fund (the Fund) is a fund of Fidelity Hereford Street Trust (the trust) and is authorized to issue an unlimited number of shares. The trust is registered under the Investment Company Act of 1940, as amended (the 1940 Act), as an open-end management investment company organized as a Delaware statutory trust. The financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America, which require management to make certain estimates and assumptions at the date of the financial statements.

2. Significant Accounting Policies.

The following summarizes the significant accounting policies of the Fund:

Book-tax differences are primarily due to deferred trustees compensation and capital loss carryforwards.

Annual Report

Notes to Financial Statements - continued

2. Significant Accounting Policies - continued

Income Tax Information and Distributions to Shareholders - continued

The tax-basis components of distributable earnings and the federal tax cost as of period end were as follows:

Unrealized appreciation	$ -
Unrealized depreciation	-
Net unrealized appreciation (depreciation)	-
Undistributed ordinary income	28,463
Capital loss carryforward	(84,291)

Cost for federal income tax purposes	$ 483,200,597

The tax character of distributions paid was as follows:

	April 30, 2007	April 30, 2006
Ordinary Income	$ 23,487,288	$ 17,417,142

3. Operating Policies.

Annual Report

3. Operating Policies - continued

Repurchase Agreements - continued

settlement date, collateral is held in segregated accounts with custodian banks and may be obtained in the event of a default of the counterparty. The Fund monitors, on a daily basis, the value of the collateral to ensure it is at least equal to the principal amount of the repurchase agreement (including accrued interest). In the event of a default by the counterparty, realization of the collateral proceeds could be delayed, during which time the value of the collateral may decline.

Reverse Repurchase Agreements. To enhance its yield, the Fund may enter into reverse repurchase agreements whereby the Fund transfers securities to a counterparty who then agrees to transfer them back to the Fund at a future date and agreed upon price, reflecting a rate of interest below market rate. The Fund receives cash proceeds, which are invested in other securities, and agrees to repay the proceeds plus accrued interest in return for the same securities transferred. The Fund continues to receive interest payments on the transferred securities during the term of the reverse repurchase agreement. During the period that a reverse repurchase agreement is outstanding, the Fund identifies cash and liquid securities as segregated in its custodian records with a value at least equal to its obligation under the agreement. If the counterparty defaults on its obligation, because of insolvency or other reasons, the Fund could experience delays and costs in recovering the security or in gaining access to the collateral. The average daily balance during the period for which reverse repurchase agreements were outstanding amounted to $5,806,056. The weighted average interest rate was 4.31%. At period end, there were no reverse repurchase agreements outstanding.

4. Fees and Other Transactions with Affiliates.

Management Fee. FMR and its affiliates provide the Fund with investment management related services for which the Fund pays a monthly management fee that is based on an annual rate of .42% of the Fund's average net assets. FMR pays all other expenses, except the compensation of the independent Trustees and certain exceptions such as interest expense, including commitment fees. The management fee paid to FMR by the Fund is reduced by an amount equal to the fees and expenses paid by the Fund to the independent Trustees.

Annual Report

Notes to Financial Statements - continued

5. Expense Reductions.

In addition, through arrangements with the Fund's custodian and transfer agent, credits realized as a result of uninvested cash balances were used to reduce the Fund's management fee. During the period, these credits reduced the Fund's management fee by $25,819.

6. Other.

Annual Report

Report of Independent Registered Public Accounting Firm

To the Trustees of Fidelity Hereford Street Trust and the Shareholders of Fidelity Government Money Market Fund:

In our opinion, the accompanying statement of assets and liabilities, including the schedule of investments, and the related statements of operations and of changes in net assets and the financial highlights present fairly, in all material respects, the financial position of Fidelity Government Money Market Fund (a fund of Fidelity Hereford Street Trust) at April 30, 2007, the results of its operations for the year then ended, the changes in its net assets for each of the two years in the period then ended and the financial highlights for each of the five years in the period then ended, in conformity with accounting principles generally accepted in the United States of America. These financial statements and financial highlights (hereafter referred to as "financial statements") are the responsibility of the Fidelity Government Money Market Fund's management. Our responsibility is to express an opinion on these financial statements based on our audits. We conducted our audits of these financial statements in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the accounting principles used and significant estimates made by management, and evaluating the overall financial statement presentation. We believe that our audits, which included confirmation of securities at April 30, 2007 by correspondence with the custodian and brokers, provide a reasonable basis for our opinion.

/s/ PricewaterhouseCoopers LLP

PricewaterhouseCoopers LLP

Boston, Massachusetts

June 13, 2007

Annual Report

Trustees and Officers

The fund's Statement of Additional Information (SAI) includes more information about the Trustees. To request a free copy, call Fidelity at 1-800-544-8544.

Interested Trustees*:

Correspondence intended for each Trustee who is an interested person may be sent to Fidelity Investments, 82 Devonshire Street, Boston, Massachusetts 02109.

Name, Age; Principal Occupation
Edward C. Johnson 3d (76)
	Year of Election or Appointment: 1993 Mr. Johnson is Chairman of the Board of Trustees. Mr. Johnson serves as President (2006-present), Chief Executive Officer, Chairman, and a Director of FMR Corp.; Chairman and a Director of FMR; Chairman and a Director of Fidelity Research & Analysis Company (FRAC); Chairman and a Director of Fidelity Investments Money Management, Inc.; and Chairman (2001-present) and a Director of FMR Co., Inc. In addition, Mr. Johnson serves as Chairman and Director of Fidelity International Limited (FIL).
James C. Curvey (71)
	Year of Election or Appointment: 2007 Mr. Curvey is Vice Chairman (2006-present) and Director of FMR Corp. Mr. Curvey joined Fidelity in 1982 and served in numerous senior management positions, including President and Chief Operating Officer of FMR Corp. (1997-2000) and President of Fidelity Strategic Investments (2000-2002). In addition, he serves as a member of the Board of Directors of Geerlings & Wade, Inc. (wine distribution).

* Trustees have been determined to be "Interested Trustees" by virtue of, among other things, their affiliation with the trust or various entities under common control with FMR.

Independent Trustees:

Correspondence intended for each Independent Trustee (that is, the Trustees other than the Interested Trustees) may be sent to Fidelity Investments, P.O. Box 55235, Boston, Massachusetts 02205-5235.

Name, Age; Principal Occupation
Dennis J. Dirks (58)
	Year of Election or Appointment: 2005 Prior to his retirement in May 2003, Mr. Dirks was Chief Operating Officer and a member of the Board of The Depository Trust & Clearing Corporation (DTCC) (1999-2003). He also served as President, Chief Operating Officer, and Board member of The Depository Trust Company (DTC) (1999-2003) and President and Board member of the National Securities Clearing Corporation (NSCC) (1999-2003). In addition, Mr. Dirks served as Chief Executive Officer and Board member of the Government Securities Clearing Corporation (2001-2003) and Chief Executive Officer and Board member of the Mortgage-Backed Securities Clearing Corporation (2001-2003). Mr. Dirks also serves as a Trustee and a member of the Finance Committee of Manhattan College (2005-present) and a Trustee and a member of the Finance Committee of AHRC of Nassau County (2006-present).
Albert R. Gamper, Jr. (65)
	Year of Election or Appointment: 2006 Prior to his retirement in December 2004, Mr. Gamper served as Chairman of the Board of CIT Group Inc. (commercial finance). During his tenure with CIT Group Inc. Mr. Gamper served in numerous senior management positions, including Chairman (1987-1989; 1999-2001; 2002-2004), Chief Executive Officer (1987-2004), and President (1989-2002). He currently serves as a member of the Board of Directors of Public Service Enterprise Group (utilities, 2001-present), Chairman of the Board of Governors, Rutgers University (2004-present), and Chairman of the Board of Saint Barnabas Health Care System.
George H. Heilmeier (70)
	Year of Election or Appointment: 2004 Dr. Heilmeier is Chairman Emeritus of Telcordia Technologies (communication software and systems), where prior to his retirement, he served as company Chairman and Chief Executive Officer. He currently serves on the Boards of Directors of The Mitre Corporation (systems engineering and information technology support for the government), and HRL Laboratories (private research and development, 2004-present). He is Chairman of the General Motors Science & Technology Advisory Board and a Life Fellow of the Institute of Electrical and Electronics Engineers (IEEE). Dr. Heilmeier is a member of the Defense Science Board and the National Security Agency Advisory Board. He is also a member of the National Academy of Engineering, the American Academy of Arts and Sciences, and the Board of Overseers of the School of Engineering and Applied Science of the University of Pennsylvania. Previously, Dr. Heilmeier served as a Director of TRW Inc. (automotive, space, defense, and information technology, 1992-2002), Compaq (1994-2002), Automatic Data Processing, Inc. (ADP) (technology-based business outsourcing, 1995-2002), INET Technologies Inc. (telecommunications network surveillance, 2001-2004), and Teletech Holdings (customer management services). He is the recipient of the 2005 Kyoto Prize in Advanced Technology for his invention of the liquid crystal display, and a member of the Consumer Electronics Hall of Fame.
James H. Keyes (66)
	Year of Election or Appointment: 2007 Prior to his retirement in 2003, Mr. Keyes was Chairman, President, and Chief Executive Officer of Johnson Controls, Inc. (automotive supplier, 1993-2003). He currently serves as a member of the boards of LSI Logic Corporation (semiconductor technologies), Navistar International Corporation (manufacture and sale of trucks, buses, and diesel engines, 2002-present), and Pitney Bowes, Inc. (integrated mail, messaging, and document management solutions).
Marie L. Knowles (60)
	Year of Election or Appointment: 2001 Prior to Ms. Knowles' retirement in June 2000, she served as Executive Vice President and Chief Financial Officer of Atlantic Richfield Company (ARCO) (diversified energy, 1996-2000). From 1993 to 1996, she was a Senior Vice President of ARCO and President of ARCO Transportation Company. She served as a Director of ARCO from 1996 to 1998. She currently serves as a Director of Phelps Dodge Corporation (copper mining and manufacturing) and McKesson Corporation (healthcare service, 2002-present). Ms. Knowles is a Trustee of the Brookings Institution and the Catalina Island Conservancy and also serves as a member of the Advisory Board for the School of Engineering of the University of Southern California.
Ned C. Lautenbach (63)
	Year of Election or Appointment: 2000 Mr. Lautenbach is Chairman of the Independent Trustees (2006-present). Mr. Lautenbach has been a partner of Clayton, Dubilier & Rice, Inc. (private equity investment firm) since September 1998. Previously, Mr. Lautenbach was with the International Business Machines Corporation (IBM) from 1968 until his retirement in 1998. Mr. Lautenbach serves as a Director of Sony Corporation (2006-present) and Eaton Corporation (diversified industrial) as well as the Philharmonic Center for the Arts in Naples, Florida. He also is a member of the Board of Trustees of Fairfield University (2005-present), as well as a member of the Council on Foreign Relations.
Cornelia M. Small (62)
	Year of Election or Appointment: 2005 Ms. Small is a member (2000-present) and Chairperson (2002-present) of the Investment Committee, and a member (2002-present) of the Board of Trustees of Smith College. Previously, she served as Chief Investment Officer (1999-2000), Director of Global Equity Investments (1996-1999), and a member of the Board of Directors of Scudder, Stevens & Clark (1990-1997) and Scudder Kemper Investments (1997-1999). In addition, Ms. Small served as Co-Chair (2000-2003) of the Annual Fund for the Fletcher School of Law and Diplomacy.
William S. Stavropoulos (67)
	Year of Election or Appointment: 2002 Mr. Stavropoulos is Chairman Emeritus of the Board of Directors of The Dow Chemical Company. Since joining The Dow Chemical Company in 1967, Mr. Stavropoulos served in numerous senior management positions, including President (1993-2000; 2002-2003), CEO (1995-2000; 2002-2004), and Chairman of the Executive Committee (2000-2004). Currently, he is a Director of NCR Corporation (data warehousing and technology solutions), Chemical Financial Corporation, Maersk Inc. (industrial conglomerate, 2002-present), Tyco International, Inc. (multinational manufacturing and services, 2007-present), and a member of the Advisory Board for Metalmark Capital (private equity investment firm, 2005-present). He is a special advisor to Clayton, Dubilier & Rice, Inc., a private equity investment firm. He also serves as a member of the Board of Trustees of the American Enterprise Institute for Public Policy Research. In addition, Mr. Stavropoulos is a member of The Business Council, J.P. Morgan International Council and the University of Notre Dame Advisory Council for the College of Science.
Kenneth L. Wolfe (68)
	Year of Election or Appointment: 2005 Prior to his retirement in 2001, Mr. Wolfe was Chairman and Chief Executive Officer of Hershey Foods Corporation (1993-2001). He currently serves as a member of the boards of Adelphia Communications Corporation (2003-present), Bausch & Lomb, Inc., and Revlon Inc. (2004-present).

Advisory Board Member and Executive Officers:

Correspondence intended for each executive officer and Mr. Lynch may be sent to Fidelity Investments, 82 Devonshire Street, Boston, Massachusetts 02109.

Name, Age; Principal Occupation
Peter S. Lynch (63)
	Year of Election or Appointment: 2003 Member of the Advisory Board of Fidelity Hereford Street Trust. Mr. Lynch is Vice Chairman and a Director of FMR, and Vice Chairman (2001-present) and a Director of FMR Co., Inc. Previously, Mr. Lynch served as a Trustee of the Fidelity funds (1990-2003). In addition, he serves as a Trustee of Boston College and as the Chairman of the Inner-City Scholarship Fund.
Kimberley H. Monasterio (43)
	Year of Election or Appointment: 2007 President and Treasurer of Government Money Market. Ms. Monasterio also serves as President and Treasurer of other Fidelity funds (2007-present) and is an employee of FMR (2004-present). Previously, Ms. Monasterio served as Deputy Treasurer of the Fidelity funds (2004-2006). Before joining Fidelity Investments, Ms. Monasterio served as Treasurer (2000-2004) and Chief Financial Officer (2002-2004) of the Franklin Templeton Funds and Senior Vice President of Franklin Templeton Services, LLC (2000-2004).
Boyce I. Greer (51)
	Year of Election or Appointment: 2006 Vice President of Government Money Market. Mr. Greer also serves as Vice President of certain Equity Funds (2005-present), certain Asset Allocation Funds (2005-present), Fixed-Income Funds (2006-present), and Money Market Funds (2006-present). Mr. Greer is also a Trustee of other investment companies advised by FMR (2003-present). He is an Executive Vice President of FMR (2005-present) and FMR Co., Inc. (2005-present), and Senior Vice President of Fidelity Investments Money Management, Inc. (2006-present). Previously, Mr. Greer served as a Director and Managing Director of Strategic Advisers, Inc. (2002-2005), and Executive Vice President (2000-2002) and Money Market Group Leader (1997-2002) of the Fidelity Investments Fixed Income Division. He also served as Vice President of Fidelity's Money Market Funds (1997-2002), Senior Vice President of FMR (1997-2002), and Vice President of FIMM (1998-2002).
Charles S. Morrison (46)
	Year of Election or Appointment: 2005 Vice President of Government Money Market. Mr. Morrison also serves as Vice President of Fidelity's Money Market Funds (2005-present) and certain Asset Allocation Funds (2002-present). Previously, he served as Vice President of Fidelity's Bond Funds (2002-2005) and certain Balanced Funds (2002-2005). He served as Vice President (2002-2005) and Bond Group Leader (2002-2005) of Fidelity Investments Fixed Income Division. Mr. Morrison is also Vice President of FIMM (2002-present) and FMR (2002-present). Mr. Morrison joined Fidelity Investments in 1987 as a Corporate Bond Analyst in the Fixed Income Research Division.
David L. Murphy (59)
	Year of Election or Appointment: 2002 Vice President of Government Money Market. Mr. Murphy also serves as Vice President of Fidelity's Money Market Funds (2002-present), certain Asset Allocation Funds (2003-present), Fixed-Income Funds (2005-present), and Balanced Funds (2005-present). He serves as Senior Vice President (2000-present) and Head (2004-present) of the Fidelity Investments Fixed Income Division. Mr. Murphy is also a Senior Vice President of Fidelity Investments Money Management, Inc. (2003-present) and an Executive Vice President of FMR (2005-present). Previously, Mr. Murphy served as Money Market Group Leader (2002-2004), Bond Group Leader (2000-2002), and Vice President of Fidelity's Taxable Bond Funds (2000-2002) and Fidelity's Municipal Bond Funds (2001-2002).
Timothy R. Huyck (42)
	Year of Election or Appointment: 2004 Vice President of Government Money Market. Mr. Huyck also serves as Vice President of other funds advised by FMR. Prior to assuming his current responsibilities, Mr. Huyck worked as a trader and portfolio manager.
Eric D. Roiter (58)
	Year of Election or Appointment: 1998 Secretary of Government Money Market. He also serves as Secretary of other Fidelity funds; Vice President, General Counsel, and Secretary of FMR Co., Inc. (2001-present) and FMR; Assistant Secretary of Fidelity Management & Research (U.K.) Inc. (2001-present), Fidelity Research & Analysis Company (2001-present), and Fidelity Investments Money Management, Inc. (2001-present). Mr. Roiter is an Adjunct Member, Faculty of Law, at Boston College Law School (2003-present). Previously, Mr. Roiter served as Vice President and Secretary of Fidelity Distributors Corporation (FDC) (1998-2005).
Scott C. Goebel (39)
	Year of Election or Appointment: 2007 Assistant Secretary of Government Money Market. Mr. Goebel also serves as Assistant Secretary of other Fidelity funds (2007-present), Vice President and Secretary of FDC (2006-present), and is an employee of FMR.
R. Stephen Ganis (41)
	Year of Election or Appointment: 2006 Anti-Money Laundering (AML) officer of Government Money Market. Mr. Ganis also serves as AML officer of other Fidelity funds (2006-present) and FMR Corp. (2003-present). Before joining Fidelity Investments, Mr. Ganis practiced law at Goodwin Procter, LLP (2000-2002).
Joseph B. Hollis (59)
	Year of Election or Appointment: 2006 Chief Financial Officer of Government Money Market. Mr. Hollis also serves as Chief Financial Officer of other Fidelity funds. Mr. Hollis is President of Fidelity Pricing and Cash Management Services (FPCMS) (2005-present). Mr. Hollis also serves as President and Director of Fidelity Service Company, Inc. (2006-present). Previously, Mr. Hollis served as Senior Vice President of Cash Management Services (1999-2002) and Investment Management Operations (2002-2005).
Kenneth A. Rathgeber (59)
	Year of Election or Appointment: 2004 Chief Compliance Officer of Government Money Market. Mr. Rathgeber also serves as Chief Compliance Officer of other Fidelity funds (2004-present) and Executive Vice President of Risk Oversight for Fidelity Investments (2002-present). He is Chief Compliance Officer of FMR (2005-present), FMR Co., Inc. (2005-present), Fidelity Management & Research (U.K.) Inc. (2005-present), Fidelity Research & Analysis Company (2005-present), Fidelity Investments Money Management, Inc. (2005-present), and Strategic Advisers, Inc. (2005-present). Previously, Mr. Rathgeber served as Executive Vice President and Chief Operating Officer for Fidelity Investments Institutional Services Company, Inc. (1998-2002).
Bryan A. Mehrmann (46)
	Year of Election or Appointment: 2005 Deputy Treasurer of Government Money Market. Mr. Mehrmann also serves as Deputy Treasurer of other Fidelity funds (2005-present) and is an employee of FMR. Previously, Mr. Mehrmann served as Vice President of Fidelity Investments Institutional Services Group (FIIS)/Fidelity Investments Institutional Operations Corporation, Inc. (FIIOC) Client Services (1998-2004).
Kenneth B. Robins (37)
	Year of Election or Appointment: 2005 Deputy Treasurer of Government Money Market. Mr. Robins also serves as Deputy Treasurer of other Fidelity funds (2005-present) and is an employee of FMR (2004-present). Before joining Fidelity Investments, Mr. Robins worked at KPMG LLP, where he was a partner in KPMG's department of professional practice (2002-2004) and a Senior Manager (1999-2000). In addition, Mr. Robins served as Assistant Chief Accountant, United States Securities and Exchange Commission (2000-2002).
Robert G. Byrnes (40)
	Year of Election or Appointment: 2005 Assistant Treasurer of Government Money Market. Mr. Byrnes also serves as Assistant Treasurer of other Fidelity funds (2005-present) and is an employee of FMR (2005-present). Previously, Mr. Byrnes served as Vice President of FPCMS (2003-2005). Before joining Fidelity Investments, Mr. Byrnes worked at Deutsche Asset Management where he served as Vice President of the Investment Operations Group (2000-2003).
Peter L. Lydecker (53)
	Year of Election or Appointment: 2004 Assistant Treasurer of Government Money Market. Mr. Lydecker also serves as Assistant Treasurer of other Fidelity funds (2004) and is an employee of FMR.
Gary W. Ryan (48)
	Year of Election or Appointment: 2005 Assistant Treasurer of Government Money Market. Mr. Ryan also serves as Assistant Treasurer of other Fidelity funds (2005-present) and is an employee of FMR (2005-present). Previously, Mr. Ryan served as Vice President of Fund Reporting in FPCMS (1999-2005).
Salvatore Schiavone (41)
	Year of Election or Appointment: 2005 Assistant Treasurer of Government Money Market. Mr. Schiavone also serves as Assistant Treasurer of other Fidelity funds (2005-present) and is an employee of FMR (2005-present). Before joining Fidelity Investments, Mr. Schiavone worked at Deutsche Asset Management, where he most recently served as Assistant Treasurer (2003-2005) of the Scudder Funds and Vice President and Head of Fund Reporting (1996-2003).

Annual Report

Distributions

A total of 5.51% of the dividends distributed during the fiscal year was derived from interest on U.S. Government securities which is generally exempt from state income tax.

The fund designates $7,922,637 of distributions paid during the period January 1, 2007 to April 30, 2007 as qualifying to be taxed as interest related dividends for nonresident alien shareholders.

The fund will notify shareholders in January 2008 of amounts for use in preparing 2007 income tax returns.

Annual Report

Proxy Voting Results

PROPOSAL PROPOSAL1
To elect a Board of Trustees. ^A
	# of Votes	% of Votes
Dennis J. Dirks
Affirmative	3,218,948,197.74	96.190
Withheld	127,485,270.73	3.810
TOTAL	3,346,433,468.47	100.000
Albert R. Gamper, Jr.
Affirmative	3,215,354,397.39	96.083
Withheld	131,079,071.08	3.917
TOTAL	3,346,433,468.47	100.000
Robert M. Gates
Affirmative	3,206,365,014.21	95.814
Withheld	140,068,454.26	4.186
TOTAL	3,346,433,468.47	100.000
George H. Heilmeier
Affirmative	3,202,447,547.40	95.697
Withheld	143,985,921.07	4.303
TOTAL	3,346,433,468.47	100.000
Edward C. Johnson 3d
Affirmative	3,193,314,793.06	95.424
Withheld	153,118,675.41	4.576
TOTAL	3,346,433,468.47	100.000
Stephen P. Jonas
Affirmative	3,212,351,847.33	95.993
Withheld	134,081,621.14	4.007
TOTAL	3,346,433,468.47	100.000
James H. Keyes^B
Affirmative	3,215,401,563.53	96.084
Withheld	131,031,904.94	3.916
TOTAL	3,346,433,468.47	100.000
	# of Votes	% of Votes
Marie L. Knowles
Affirmative	3,215,966,891.46	96.101
Withheld	130,466,577.01	3.899
TOTAL	3,346,433,468.47	100.000
Ned C. Lautenbach
Affirmative	3,208,900,601.85	95.890
Withheld	137,532,866.62	4.110
TOTAL	3,346,433,468.47	100.000
William O. McCoy
Affirmative	3,201,902,631.61	95.681
Withheld	144,530,836.86	4.319
TOTAL	3,346,433,468.47	100.000
Robert L. Reynolds
Affirmative	3,217,595,027.12	96.150
Withheld	128,838,441.35	3.850
TOTAL	3,346,433,468.47	100.000
Cornelia M. Small
Affirmative	3,212,941,689.62	96.011
Withheld	133,491,778.85	3.989
TOTAL	3,346,433,468.47	100.000
William S. Stavropoulos
Affirmative	3,212,375,473.68	95.994
Withheld	134,057,994.79	4.006
TOTAL	3,346,433,468.47	100.000
Kenneth L. Wolfe
Affirmative	3,211,985,097.72	95.982
Withheld	134,448,370.75	4.018
TOTAL	3,346,433,468.47	100.000
^A Denotes trust-wide proposal and voting results. ^B Effective on or about January 1, 2007.

Annual Report

Managing Your Investments

By Phone

(phone_graphic)

Fidelity Automated
Service Telephone (FAST®)
1-800-544-5555

Press

1 For mutual fund and brokerage trading.

2 For quotes.*

3 For account balances and holdings.

4 To review orders and mutual
fund activity.

5 To change your PIN.

*0 To speak to a Fidelity representative.

By PC

Fidelity's web site on the Internet provides a wide range of information, including daily financial news, fund performance, interactive planning tools and news about Fidelity products and services.

(computer_graphic)

Fidelity's Web Site
www.fidelity.com

Annual Report

To Visit Fidelity

For directions and hours,
please call 1-800-544-9797.

Arizona

7001 West Ray Road
Chandler, AZ

15445 N. Scottsdale Road
Scottsdale, AZ

California

815 East Birch Street
Brea, CA

1411 Chapin Avenue
Burlingame, CA

851 East Hamilton Avenue
Campbell, CA

19200 Von Karman Avenue
Irvine, CA

601 Larkspur Landing Circle
Larkspur, CA

10100 Santa Monica Blvd.
Los Angeles, CA

27101 Puerta Real
Mission Viejo, CA

73-575 El Paseo
Palm Desert, CA

251 University Avenue
Palo Alto, CA

123 South Lake Avenue
Pasadena, CA

16995 Bernardo Ctr. Drive
Rancho Bernardo, CA

1220 Roseville Parkway
Roseville, CA

1740 Arden Way
Sacramento, CA

7676 Hazard Center Drive
San Diego, CA

11943 El Camino Real
San Diego, CA

8 Montgomery Street
San Francisco, CA

3793 State Street
Santa Barbara, CA

1200 Wilshire Boulevard
Santa Monica, CA

21701 Hawthorne Boulevard
Torrance, CA

2001 North Main Street
Walnut Creek, CA

6300 Canoga Avenue
Woodland Hills, CA

Colorado

1625 Broadway
Denver, CO

9185 Westview Road
Lone Tree, CO

Connecticut

48 West Putnam Avenue
Greenwich, CT

265 Church Street
New Haven, CT

300 Atlantic Street
Stamford, CT

29 South Main Street
West Hartford, CT

Delaware

400 Delaware Avenue
Wilmington, DE

Florida

4400 N. Federal Highway
Boca Raton, FL

121 Alhambra Plaza
Coral Gables, FL

2948 N. Federal Highway
Ft. Lauderdale, FL

4671 Town Center Parkway
Jacksonville, FL

1907 West State Road 434
Longwood, FL

8880 Tamiami Trail, North
Naples, FL

3501 PGA Boulevard
Palm Beach Gardens, FL

3550 Tamiami Trail, South
Sarasota, FL

1502 N. Westshore Blvd.
Tampa, FL

2465 State Road 7
Wellington, FL

Georgia

3445 Peachtree Road, N.E.
Atlanta, GA

1000 Abernathy Road
Atlanta, GA

Illinois

One North LaSalle Street
Chicago, IL

875 North Michigan Ave.
Chicago, IL

1415 West 22nd Street
Oak Brook, IL

1572 East Golf Road
Schaumburg, IL

3232 Lake Avenue
Wilmette, IL

Indiana

4729 East 82nd Street
Indianapolis, IN

Kansas

5400 College Boulevard
Overland Park, KS

Maine

Three Canal Plaza
Portland, ME

Maryland

7315 Wisconsin Avenue
Bethesda, MD

One W. Pennsylvania Ave.
Towson, MD

Massachusetts

801 Boylston Street
Boston, MA

155 Congress Street
Boston, MA

300 Granite Street
Braintree, MA

44 Mall Road
Burlington, MA

238 Main Street
Cambridge, MA

405 Cochituate Road
Framingham, MA

416 Belmont Street
Worcester, MA

Fidelity Brokerage Services, Inc., 100 Summer St., Boston, MA 02110 Member NYSE/SIPC

Annual Report

Michigan

500 E. Eisenhower Pkwy.
Ann Arbor, MI

280 Old N. Woodward Ave.
Birmingham, MI

43420 Grand River Avenue
Novi, MI

29155 Northwestern Hwy.
Southfield, MI

Minnesota

7600 France Avenue South
Edina, MN

Missouri

1524 South Lindbergh Blvd.
St. Louis, MO

Nevada

2225 Village Walk Drive
Henderson, NV

New Jersey

150 Essex Street
Millburn, NJ

56 South Street
Morristown, NJ

396 Route 17, North
Paramus, NJ

3518 Route 1 North
Princeton, NJ

530 Broad Street
Shrewsbury, NJ

New York

1055 Franklin Avenue
Garden City, NY

37 West Jericho Turnpike
Huntington Station, NY

1271 Avenue of the Americas
New York, NY

980 Madison Avenue
New York, NY

61 Broadway
New York, NY

350 Park Avenue
New York, NY

200 Fifth Avenue
New York, NY

733 Third Avenue
New York, NY

11 Penn Plaza
New York, NY

2070 Broadway
New York, NY

1075 Northern Blvd.
Roslyn, NY

799 Central Park Avenue
Scarsdale, NY

North Carolina

4611 Sharon Road
Charlotte, NC

7011 Fayetteville Road
Durham, NC

Ohio

3805 Edwards Road
Cincinnati, OH

1324 Polaris Parkway
Columbus, OH

28699 Chagrin Boulevard
Woodmere Village, OH

Oregon

7493 SW Bridgeport Road
Tigard, OR

Pennsylvania

600 West DeKalb Pike
King of Prussia, PA

1735 Market Street
Philadelphia, PA

12001 Perry Highway
Wexford, PA

Rhode Island

47 Providence Place
Providence, RI

Tennessee

6150 Poplar Avenue
Memphis, TN

Texas

10000 Research Boulevard
Austin, TX

4001 Northwest Parkway
Dallas, TX

12532 Memorial Drive
Houston, TX

2701 Drexel Drive
Houston, TX

6560 Fannin Street
Houston, TX

6500 N. MacArthur Blvd.
Irving, TX

6005 West Park Boulevard
Plano, TX

14100 San Pedro
San Antonio, TX

1576 East Southlake Blvd.
Southlake, TX

19740 IH 45 North
Spring, TX

Utah

279 West South Temple
Salt Lake City, UT

Virginia

1861 International Drive
McLean, VA

Washington

411 108th Avenue, N.E.
Bellevue, WA

1518 6th Avenue
Seattle, WA

Washington, DC

1900 K Street, N.W.
Washington, DC

Wisconsin

595 North Barker Road
Brookfield, WI

Annual Report

Investment Adviser

Fidelity Management & Research Company
Boston, MA

Investment Sub-Advisers

Fidelity Investments
Money Management, Inc.

Fidelity Research & Analysis Company
(formerly Fidelity Management &
Research (Far East) Inc.)

Fidelity International Investment Advisors

Fidelity International Investment Advisors
(U.K.) Limited

General Distributor

Fidelity Distributors Corporation

Boston, MA

Transfer and Service Agent

Fidelity Service Company, Inc.

Boston, MA

Custodian

JPMorgan Chase Bank

New York, NY

The Fidelity Telephone Connection

Mutual Fund 24-Hour Service

Exchanges/Redemptions
and Account Assistance 1-800-544-6666

Product Information 1-800-544-6666

Retirement Accounts 1-800-544-4774 (8 a.m. - 9 p.m.)

TDD Service 1-800-544-0118
for the deaf and hearing impaired
(9 a.m. - 9 p.m. Eastern time)

Fidelity Automated Service
Telephone (FAST®) (automated graphic) 1-800-544-5555

(automated graphic) Automated line for quickest service

(Fidelity Investment logo)(registered trademark)
Corporate Headquarters
82 Devonshire St., Boston, MA 02109
www.fidelity.com

SPU-UANN-0607
1.784733.104

Fidelity®

U.S. Treasury
Money Market Fund

Annual Report

April 30, 2007

(2_fidelity_logos) (Registered_Trademark)

Chairman's Message	<Click Here>	Ned Johnson's message to shareholders.
Shareholder Expense Example	<Click Here>	An example of shareholder expenses.
Investment Changes/ Performance	<Click Here>	A summary of major shifts in the fund's investments over the past six months and one year, and performance information.
Investments	<Click Here>	A complete list of the fund's investments.
Financial Statements	<Click Here>	Statements of assets and liabilities, operations, and changes in net assets, as well as financial highlights.
Notes	<Click Here>	Notes to the financial statements.
Report of Independent Registered Public Accounting Firm	<Click Here>
Trustees and Officers	<Click Here>
Distributions	<Click Here>
Proxy Voting Results	<Click Here>

Standard & Poor's, S&P and S&P 500 are registered service marks of The McGraw-Hill Companies, Inc. and have been licensed for use by Fidelity Distributors Corporation.

Other third party marks appearing herein are the property of their respective owners.

All other marks appearing herein are registered or unregistered trademarks or service marks of FMR Corp. or an affiliated company.

NOT FDIC INSURED ·MAY LOSE VALUE ·NO BANK GUARANTEE

Neither the fund nor Fidelity Distributors Corporation is a bank.

Annual Report

Chairman's Message

(photo_of_Edward_C_Johnson_3d)

Dear Shareholder:

Sincerely,

/s/Edward C. Johnson 3d

Edward C. Johnson 3d

Annual Report

Shareholder Expense Example

The Example is based on an investment of $1,000 invested at the beginning of the period and held for the entire period (November 1, 2006 to April 30, 2007).

Actual Expenses

Hypothetical Example for Comparison Purposes

	Beginning Account Value November 1, 2006	Ending Account Value April 30, 2007	Expenses Paid During Period* November 1, 2006 to April 30, 2007
Actual	$ 1,000.00	$ 1,023.40	$ 2.41
Hypothetical (5% return per year before expenses)	$ 1,000.00	$ 1,022.41	$ 2.41

* Expenses are equal to the Fund's annualized expense ratio of .48%; multiplied by the average account value over the period, multiplied by 181/365 (to reflect the one-half year period).

Semiannual Report

Investment Changes/Performance

Maturity Diversification
Days	% of fund's investments 4/30/07	% of fund's investments 10/31/06	% of fund's investments 4/30/06
0 - 30	22.5	46.3	43.3
31 - 90	47.0	26.7	46.2
91 - 180	30.5	27.0	9.2
181 - 397	0.0	0.0	1.3
Weighted Average Maturity
	4/30/07	10/31/06	4/30/06
Fidelity U.S. Treasury Money Market Fund	60 Days	57 Days	46 Days
Treasury Retail Money Market Funds Average *	58 Days	61 Days	55 Days

Asset Allocation (% of fund's net assets)
As of April 30, 2007		As of October 31, 2006
	U.S. Treasury Bills 70.7%		U.S. Treasury Bills 76.4%
	U.S. Treasury Bonds and U.S. Treasury Notes 29.2%		U.S. Treasury Bonds and U.S. Treasury Notes 27.3%
	Net Other Assets 0.1%		Net Other Assets** (3.7)%

**Net Other Assets are not included in the pie chart.

Current and Historical Seven-Day Yields

	5/1/07	1/30/07	10/31/06	8/1/06	5/2/06
Fidelity U.S. Treasury Money Market Fund	4.66%	4.68%	4.65%	4.52%	4.18%

*Source: iMoneyNet, Inc.

Annual Report

Investments April 30, 2007

Showing Percentage of Net Assets

U.S. Treasury Obligations - 99.9%
	Due Date	Yield (a)	Principal Amount (000s)	Value (000s)
U.S. Treasury Bills - 70.7%
	5/10/07 to 8/16/07	4.90 to 5.10%	$ 1,276,904	$ 1,268,129
U.S. Treasury Notes - 29.2%
	5/15/07 to 8/15/07	4.93 to 5.08	526,414	523,897

TOTAL INVESTMENT PORTFOLIO - 99.9% (Cost $1,792,026)		1,792,026
NET OTHER ASSETS - 0.1%		989
NET ASSETS - 100%	$ 1,793,015

Legend

(a) Yield represents either the annualized yield at the date of purchase, or the stated coupon rate, or, for floating rate securities, the rate at period end.

Income Tax Information

At April 30, 2007, the fund had a capital loss carryforward of approximately $583,000 of which $190,000, $376,000 and $17,000 will expire on April 30, 2012, 2013 and 2014, respectively.

See accompanying notes which are an integral part of the financial statements.

Annual Report

Financial Statements

Statement of Assets and Liabilities

Amounts in thousands (except per-share amount)	April 30, 2007

Assets
Investment in securities, at value - See accompanying schedule: Unaffiliated issuers (cost $1,792,026)		$ 1,792,026
Receivable for investments sold		41,621
Receivable for fund shares sold		5,528
Interest receivable		4,839
Other receivables		5
Total assets		1,844,019

Liabilities
Payable for investments purchased	$ 42,070
Payable for fund shares redeemed	7,881
Distributions payable	417
Accrued management fee	632
Other affiliated payables	4
Total liabilities		51,004

Net Assets		$ 1,793,015
Net Assets consist of:
Paid in capital		$ 1,793,603
Distributions in excess of net investment income		(4)
Accumulated undistributed net realized gain (loss) on investments		(584)
Net Assets, for 1,793,133 shares outstanding		$ 1,793,015
Net Asset Value, offering price and redemption price per share ($1,793,015 ÷ 1,793,133 shares)		$ 1.00

See accompanying notes which are an integral part of the financial statements.

Annual Report

Financial Statements - continued

Statement of Operations

Amounts in thousands	Year ended April 30, 2007

Investment Income
Interest		$ 90,410

Expenses
Management fee	$ 7,477
Independent trustees' compensation	6
Interest	1,222
Total expenses before reductions	8,705
Expense reductions	(69)	8,636
Net investment income		81,774
Realized and Unrealized Gain (Loss) Net realized gain (loss) on:
Investment securities:
Unaffiliated issuers		66
Net increase in net assets resulting from operations		$ 81,840

See accompanying notes which are an integral part of the financial statements.

Annual Report

Statement of Changes in Net Assets

Amounts in thousands	Year ended April 30, 2007	Year ended April 30, 2006
Increase (Decrease) in Net Assets
Operations
Net investment income	$ 81,774	$ 61,428
Net realized gain (loss)	66	(16)
Net increase in net assets resulting from operations	81,840	61,412
Distributions to shareholders from net investment income	(81,772)	(61,425)
Share transactions at net asset value of $1.00 per share Proceeds from sales of shares	1,094,833	1,319,338
Reinvestment of distributions	76,724	57,839
Cost of shares redeemed	(1,141,964)	(1,648,815)
Net increase (decrease) in net assets and shares resulting from share transactions	29,593	(271,638)
Total increase (decrease) in net assets	29,661	(271,651)

Net Assets
Beginning of period	1,763,354	2,035,005
End of period (including distributions in excess of net investment income of $4 and distributions in excess of net investment income of $6, respectively)	$ 1,793,015	$ 1,763,354

See accompanying notes which are an integral part of the financial statements.

Annual Report

Financial Highlights

Years ended April 30,	2007	2006	2005	2004	2003
Selected Per-Share Data
Net asset value, beginning of period	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00
Income from Investment Operations
Net investment income	.046	.032	.014	.006	.012
Net realized and unrealized gain (loss) ^D	-	-	-	-	-
Total from investment operations	.046	.032	.014	.006	.012
Distributions from net investment income	(.046)	(.032)	(.014)	(.006)	(.012)
Distributions from net realized gain	-	-	- ^D	-	-
Total distributions	(.046)	(.032)	(.014)	(.006)	(.012)
Net asset value, end of period	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00
Total Return ^{A, B}	4.69%	3.29%	1.38%	.65%	1.23%
Ratios to Average Net Assets ^C
Expenses before reductions	.49%	.52%	.46%	.42%	.42%
Expenses net of fee waivers, if any	.49%	.52%	.46%	.42%	.42%
Expenses net of all reductions	.48%	.52%	.46%	.42%	.42%
Net investment income	4.59%	3.22%	1.34%	.65%	1.21%
Supplemental Data
Net assets, end of period (in millions)	$ 1,793	$ 1,763	$ 2,035	$ 2,235	$ 2,613

^A Total returns would have been lower had certain expenses not been reduced during the periods shown.

^B Total returns do not include the effect of the account closeout fee.

^D Amount represents less than $.001 per share.

See accompanying notes which are an integral part of the financial statements.

Semiannual Report

Notes to Financial Statements

For the period ended April 30, 2007

(Amounts in thousands except ratios)

1. Organization.

Fidelity U.S. Treasury Money Market Fund (the Fund) is a fund of Fidelity Hereford Street Trust (the trust) and is authorized to issue an unlimited number of shares. The trust is registered under the Investment Company Act of 1940, as amended (the 1940 Act), as an open-end management investment company organized as a Delaware statutory trust. The financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America, which require management to make certain estimates and assumptions at the date of the financial statements.

2. Significant Accounting Policies.

The following summarizes the significant accounting policies of the Fund:

Book-tax differences are primarily due to deferred trustees compensation, capital loss carryforwards and losses deferred due to wash sales.

Annual Report

Notes to Financial Statements - continued

(Amounts in thousands except ratios)

2. Significant Accounting Policies - continued

Income Tax Information and Distributions to Shareholders - continued

The tax-basis components of distributable earnings and the federal tax cost as of period end were as follows:

Unrealized appreciation	$ -
Unrealized depreciation	-
Net unrealized appreciation (depreciation)	-
Undistributed ordinary income	1
Capital loss carryforward	(583)

Cost for federal income tax purposes	$ 1,792,026

The tax character of distributions paid was as follows:

	April 30, 2007	April 30, 2006
Ordinary Income	$ 81,772	$ 61,425

3. Operating Policies.

Annual Report

3. Operating Policies - continued

Repurchase Agreements - continued

Reverse Repurchase Agreements. To enhance its yield, the Fund may enter into reverse repurchase agreements whereby the Fund transfers securities to a counterparty who then agrees to transfer them back to the Fund at a future date and agreed upon price, reflecting a rate of interest below market rate. The Fund receives cash proceeds, which are invested in other securities, and agrees to repay the proceeds plus accrued interest in return for the same securities transferred. The Fund continues to receive interest payments on the transferred securities during the term of the reverse repurchase agreement. During the period that a reverse repurchase agreement is outstanding, the Fund identifies cash and liquid securities as segregated in its custodian records with a value at least equal to its obligation under the agreement. If the counterparty defaults on its obligation, because of insolvency or other reasons, the Fund could experience delays and costs in recovering the security or in gaining access to the collateral. The average daily balance during the period for which reverse repurchase agreements were outstanding amounted to $73,775. The weighted average interest rate was 4.52%. At period end, there were no reverse repurchase agreements outstanding.

4. Fees and Other Transactions with Affiliates.

Annual Report

Notes to Financial Statements - continued

(Amounts in thousands except ratios)

5. Expense Reductions.

6. Other.

Annual Report

Report of Independent Registered Public Accounting Firm

To the Trustees of Fidelity Hereford Street Trust and the Shareholders of Fidelity U.S. Treasury Money Market Fund:

In our opinion, the accompanying statement of assets and liabilities, including the schedule of investments, and the related statements of operations and of changes in net assets and the financial highlights present fairly, in all material respects, the financial position of Fidelity U.S. Treasury Money Market Fund (a fund of Fidelity Hereford Street Trust) at April 30, 2007, the results of its operations for the year then ended, the changes in its net assets for each of the two years in the period then ended and the financial highlights for each of the five years in the period then ended, in conformity with accounting principles generally accepted in the United States of America. These financial statements and financial highlights (hereafter referred to as "financial statements") are the responsibility of the Fidelity U.S. Treasury Money Market Fund's management. Our responsibility is to express an opinion on these financial statements based on our audits. We conducted our audits of these financial statements in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the accounting principles used and significant estimates made by management, and evaluating the overall financial statement presentation. We believe that our audits, which included confirmation of securities at April 30, 2007 by correspondence with the custodian and brokers, provide a reasonable basis for our opinion.

/s/ PricewaterhouseCoopers LLP

PricewaterhouseCoopers LLP

Boston, Massachusetts

June 13, 2007

Annual Report

Trustees and Officers

The fund's Statement of Additional Information (SAI) includes more information about the Trustees. To request a free copy, call Fidelity at 1-800-544-8544.

Interested Trustees*:

Correspondence intended for each Trustee who is an interested person may be sent to Fidelity Investments, 82 Devonshire Street, Boston, Massachusetts 02109.

Name, Age; Principal Occupation
Edward C. Johnson 3d (76)
	Year of Election or Appointment: 1993 Mr. Johnson is Chairman of the Board of Trustees. Mr. Johnson serves as President (2006-present), Chief Executive Officer, Chairman, and a Director of FMR Corp.; Chairman and a Director of FMR; Chairman and a Director of Fidelity Research & Analysis Company (FRAC); Chairman and a Director of Fidelity Investments Money Management, Inc.; and Chairman (2001-present) and a Director of FMR Co., Inc. In addition, Mr. Johnson serves as Chairman and Director of Fidelity International Limited (FIL).
James C. Curvey (71)
	Year of Election or Appointment: 2007 Mr. Curvey is Vice Chairman (2006-present) and Director of FMR Corp. Mr. Curvey joined Fidelity in 1982 and served in numerous senior management positions, including President and Chief Operating Officer of FMR Corp. (1997-2000) and President of Fidelity Strategic Investments (2000-2002). In addition, he serves as a member of the Board of Directors of Geerlings & Wade, Inc. (wine distribution).

* Trustees have been determined to be "Interested Trustees" by virtue of, among other things, their affiliation with the trust or various entities under common control with FMR.

Independent Trustees:

Correspondence intended for each Independent Trustee (that is, the Trustees other than the Interested Trustees) may be sent to Fidelity Investments, P.O. Box 55235, Boston, Massachusetts 02205-5235.

Name, Age; Principal Occupation
Dennis J. Dirks (58)
	Year of Election or Appointment: 2005 Prior to his retirement in May 2003, Mr. Dirks was Chief Operating Officer and a member of the Board of The Depository Trust & Clearing Corporation (DTCC) (1999-2003). He also served as President, Chief Operating Officer, and Board member of The Depository Trust Company (DTC) (1999-2003) and President and Board member of the National Securities Clearing Corporation (NSCC) (1999-2003). In addition, Mr. Dirks served as Chief Executive Officer and Board member of the Government Securities Clearing Corporation (2001-2003) and Chief Executive Officer and Board member of the Mortgage-Backed Securities Clearing Corporation (2001-2003). Mr. Dirks also serves as a Trustee and a member of the Finance Committee of Manhattan College (2005- present) and a Trustee and a member of the Finance Committee of AHRC of Nassau County (2006-present).
Albert R. Gamper, Jr. (65)
	Year of Election or Appointment: 2006 Prior to his retirement in December 2004, Mr. Gamper served as Chairman of the Board of CIT Group Inc. (commercial finance). During his tenure with CIT Group Inc. Mr. Gamper served in numerous senior management positions, including Chairman (1987-1989; 1999-2001; 2002-2004), Chief Executive Officer (1987-2004), and President (1989- 2002). He currently serves as a member of the Board of Directors of Public Service Enterprise Group (utilities, 2001-present), Chairman of the Board of Governors, Rutgers University (2004-present), and Chairman of the Board of Saint Barnabas Health Care System.
George H. Heilmeier (70)
	Year of Election or Appointment: 2004 Dr. Heilmeier is Chairman Emeritus of Telcordia Technologies (communication software and systems), where prior to his retirement, he served as company Chairman and Chief Executive Officer. He currently serves on the Boards of Directors of The Mitre Corporation (systems engineering and information technology support for the government), and HRL Laboratories (private research and development, 2004-present). He is Chairman of the General Motors Science & Technology Advisory Board and a Life Fellow of the Institute of Electrical and Electronics Engineers (IEEE). Dr. Heilmeier is a member of the Defense Science Board and the National Security Agency Advisory Board. He is also a member of the National Academy of Engineering, the American Academy of Arts and Sciences, and the Board of Overseers of the School of Engineering and Applied Science of the University of Pennsylvania. Previously, Dr. Heilmeier served as a Director of TRW Inc. (automotive, space, defense, and information technology, 1992-2002), Compaq (1994-2002), Automatic Data Processing, Inc. (ADP) (technology-based business outsourcing, 1995-2002), INET Technologies Inc. (telecommunications network surveillance, 2001-2004), and Teletech Holdings (customer management services). He is the recipient of the 2005 Kyoto Prize in Advanced Technology for his invention of the liquid crystal display, and a member of the Consumer Electronics Hall of Fame.
James H. Keyes (66)
	Year of Election or Appointment: 2007 Prior to his retirement in 2003, Mr. Keyes was Chairman, President, and Chief Executive Officer of Johnson Controls, Inc. (automotive supplier, 1993-2003). He currently serves as a member of the boards of LSI Logic Corporation (semiconductor technologies), Navistar International Corporation (manufacture and sale of trucks, buses, and diesel engines, 2002-present), and Pitney Bowes, Inc. (integrated mail, messaging, and document management solutions).
Marie L. Knowles (60)
	Year of Election or Appointment: 2001 Prior to Ms. Knowles' retirement in June 2000, she served as Executive Vice President and Chief Financial Officer of Atlantic Richfield Company (ARCO) (diversified energy, 1996-2000). From 1993 to 1996, she was a Senior Vice President of ARCO and President of ARCO Transportation Company. She served as a Director of ARCO from 1996 to 1998. She currently serves as a Director of Phelps Dodge Corporation (copper mining and manufacturing) and McKesson Corporation (healthcare service, 2002-present). Ms. Knowles is a Trustee of the Brookings Institution and the Catalina Island Conservancy and also serves as a member of the Advisory Board for the School of Engineering of the University of Southern California.
Ned C. Lautenbach (63)
	Year of Election or Appointment: 2000 Mr. Lautenbach is Chairman of the Independent Trustees (2006-present). Mr. Lautenbach has been a partner of Clayton, Dubilier & Rice, Inc. (private equity investment firm) since September 1998. Previously, Mr. Lautenbach was with the International Business Machines Corporation (IBM) from 1968 until his retirement in 1998. Mr. Lautenbach serves as a Director of Sony Corporation (2006-present) and Eaton Corporation (diversified industrial) as well as the Philharmonic Center for the Arts in Naples, Florida. He also is a member of the Board of Trustees of Fairfield University (2005-present), as well as a member of the Council on Foreign Relations.
Cornelia M. Small (62)
	Year of Election or Appointment: 2005 Ms. Small is a member (2000-present) and Chairperson (2002-present) of the Investment Committee, and a member (2002-present) of the Board of Trustees of Smith College. Previously, she served as Chief Investment Officer (1999-2000), Director of Global Equity Investments (1996-1999), and a member of the Board of Directors of Scudder, Stevens & Clark (1990-1997) and Scudder Kemper Investments (1997-1999). In addition, Ms. Small served as Co-Chair (2000-2003) of the Annual Fund for the Fletcher School of Law and Diplomacy.
William S. Stavropoulos (67)
	Year of Election or Appointment: 2002 Mr. Stavropoulos is Chairman Emeritus of the Board of Directors of The Dow Chemical Company. Since joining The Dow Chemical Company in 1967, Mr. Stavropoulos served in numerous senior management positions, including President (1993-2000; 2002-2003), CEO (1995-2000; 2002-2004), and Chairman of the Executive Committee (2000-2004). Currently, he is a Director of NCR Corporation (data warehousing and technology solutions), Chemical Financial Corporation, Maersk Inc. (industrial conglomerate, 2002-present), Tyco International, Inc. (multinational manufacturing and services, 2007-present), and a member of the Advisory Board for Metalmark Capital (private equity investment firm, 2005-present). He is a special advisor to Clayton, Dubilier & Rice, Inc., a private equity investment firm. He also serves as a member of the Board of Trustees of the American Enterprise Institute for Public Policy Research. In addition, Mr. Stavropoulos is a member of The Business Council, J.P. Morgan International Council and the University of Notre Dame Advisory Council for the College of Science.
Kenneth L. Wolfe (68)
	Year of Election or Appointment: 2005 Prior to his retirement in 2001, Mr. Wolfe was Chairman and Chief Executive Officer of Hershey Foods Corporation (1993-2001). He currently serves as a member of the boards of Adelphia Communications Corporation (2003-present), Bausch & Lomb, Inc., and Revlon Inc. (2004-present).

Advisory Board Member and Executive Officers:

Correspondence intended for each executive officer and Mr. Lynch may be sent to Fidelity Investments, 82 Devonshire Street, Boston, Massachusetts 02109.

Name, Age; Principal Occupation
Peter S. Lynch (63)
	Year of Election or Appointment: 2003 Member of the Advisory Board of Fidelity Hereford Street Trust. Mr. Lynch is Vice Chairman and a Director of FMR, and Vice Chairman (2001-present) and a Director of FMR Co., Inc. Previously, Mr. Lynch served as a Trustee of the Fidelity funds (1990-2003). In addition, he serves as a Trustee of Boston College and as the Chairman of the Inner-City Scholarship Fund.
Kimberley H. Monasterio (43)
	Year of Election or Appointment: 2007 President and Treasurer of U.S. Treasury Money Market. Ms. Monasterio also serves as President and Treasurer of other Fidelity funds (2007- present) and is an employee of FMR (2004-present). Previously, Ms. Monasterio served as Deputy Treasurer of the Fidelity funds (2004- 2006). Before joining Fidelity Investments, Ms. Monasterio served as Treasurer (2000-2004) and Chief Financial Officer (2002-2004) of the Franklin Templeton Funds and Senior Vice President of Franklin Templeton Services, LLC (2000-2004).
Boyce I. Greer (51)
	Year of Election or Appointment: 2006 Vice President of U.S. Treasury Money Market. Mr. Greer also serves as Vice President of certain Equity Funds (2005-present), certain Asset Allocation Funds (2005-present), Fixed-Income Funds (2006-present), and Money Market Funds (2006-present). Mr. Greer is also a Trustee of other investment companies advised by FMR (2003-present). He is an Executive Vice President of FMR (2005-present) and FMR Co., Inc. (2005-present), and Senior Vice President of Fidelity Investments Money Management, Inc. (2006-present). Previously, Mr. Greer served as a Director and Managing Director of Strategic Advisers, Inc. (2002- 2005), and Executive Vice President (2000-2002) and Money Market Group Leader (1997-2002) of the Fidelity Investments Fixed Income Division. He also served as Vice President of Fidelity's Money Market Funds (1997-2002), Senior Vice President of FMR (1997-2002), and Vice President of FIMM (1998-2002).
Charles S. Morrison (46)
	Year of Election or Appointment: 2005 Vice President of U.S. Treasury Money Market. Mr. Morrison also serves as Vice President of Fidelity's Money Market Funds (2005-present) and certain Asset Allocation Funds (2002-present). Previously, he served as Vice President of Fidelity's Bond Funds (2002-2005) and certain Balanced Funds (2002-2005). He served as Vice President (2002-2005) and Bond Group Leader (2002-2005) of Fidelity Investments Fixed Income Division. Mr. Morrison is also Vice President of FIMM (2002- present) and FMR (2002-present). Mr. Morrison joined Fidelity Investments in 1987 as a Corporate Bond Analyst in the Fixed Income Research Division.
David L. Murphy (59)
	Year of Election or Appointment: 2002 Vice President of U.S. Treasury Money Market. Mr. Murphy also serves as Vice President of Fidelity's Money Market Funds (2002-present), certain Asset Allocation Funds (2003-present), Fixed-Income Funds (2005- present), and Balanced Funds (2005-present). He serves as Senior Vice President (2000-present) and Head (2004-present) of the Fidelity Investments Fixed Income Division. Mr. Murphy is also a Senior Vice President of Fidelity Investments Money Management, Inc. (2003-present) and an Executive Vice President of FMR (2005-present). Previously, Mr. Murphy served as Money Market Group Leader (2002-2004), Bond Group Leader (2000-2002), and Vice President of Fidelity's Taxable Bond Funds (2000-2002) and Fidelity's Municipal Bond Funds (2001-2002).
Timothy R. Huyck (42)
	Year of Election or Appointment: 2004 Vice President of U.S. Treasury Money Market. Mr. Huyck also serves as Vice President of other funds advised by FMR. Prior to assuming his current responsibilities, Mr. Huyck worked as a trader and portfolio manager.
Eric D. Roiter (58)
	Year of Election or Appointment: 1998 Secretary of U.S. Treasury Money Market. He also serves as Secretary of other Fidelity funds; Vice President, General Counsel, and Secretary of FMR Co., Inc. (2001-present) and FMR; Assistant Secretary of Fidelity Management & Research (U.K.) Inc. (2001-present), Fidelity Research & Analysis Company (2001-present), and Fidelity Investments Money Management, Inc. (2001-present). Mr. Roiter is an Adjunct Member, Faculty of Law, at Boston College Law School (2003-present). Previously, Mr. Roiter served as Vice President and Secretary of Fidelity Distributors Corporation (FDC) (1998-2005).
Scott C. Goebel (39)
	Year of Election or Appointment: 2007 Assistant Secretary of U.S. Treasury Money Market. Mr. Goebel also serves as Assistant Secretary of other Fidelity funds (2007-present), Vice President and Secretary of FDC (2006-present), and is an employee of FMR.
R. Stephen Ganis (41)
	Year of Election or Appointment: 2006 Anti-Money Laundering (AML) officer of U.S. Treasury Money Market. Mr. Ganis also serves as AML officer of other Fidelity funds (2006- present) and FMR Corp. (2003-present). Before joining Fidelity Investments, Mr. Ganis practiced law at Goodwin Procter, LLP (2000-2002).
Joseph B. Hollis (59)
	Year of Election or Appointment: 2006 Chief Financial Officer of U.S. Treasury Money Market. Mr. Hollis also serves as Chief Financial Officer of other Fidelity funds. Mr. Hollis is President of Fidelity Pricing and Cash Management Services (FPCMS) (2005-present). Mr. Hollis also serves as President and Director of Fidelity Service Company, Inc. (2006-present). Previously, Mr. Hollis served as Senior Vice President of Cash Management Services (1999-2002) and Investment Management Operations (2002-2005).
Kenneth A. Rathgeber (59)
	Year of Election or Appointment: 2004 Chief Compliance Officer of U.S. Treasury Money Market. Mr. Rathgeber also serves as Chief Compliance Officer of other Fidelity funds (2004- present) and Executive Vice President of Risk Oversight for Fidelity Investments (2002-present). He is Chief Compliance Officer of FMR (2005-present), FMR Co., Inc. (2005-present), Fidelity Management & Research (U.K.) Inc. (2005-present), Fidelity Research & Analysis Company (2005-present), Fidelity Investments Money Management, Inc. (2005-present), and Strategic Advisers, Inc. (2005-present). Previously, Mr. Rathgeber served as Executive Vice President and Chief Operating Officer for Fidelity Investments Institutional Services Company, Inc. (1998-2002).
Bryan A. Mehrmann (46)
	Year of Election or Appointment: 2005 Deputy Treasurer of U.S. Treasury Money Market. Mr. Mehrmann also serves as Deputy Treasurer of other Fidelity funds (2005-present) and is an employee of FMR. Previously, Mr. Mehrmann served as Vice President of Fidelity Investments Institutional Services Group (FIIS)/Fidelity Investments Institutional Operations Corporation, Inc. (FIIOC) Client Services (1998-2004).
Kenneth B. Robins (37)
	Year of Election or Appointment: 2005 Deputy Treasurer of U.S. Treasury Money Market. Mr. Robins also serves as Deputy Treasurer of other Fidelity funds (2005-present) and is an employee of FMR (2004-present). Before joining Fidelity Investments, Mr. Robins worked at KPMG LLP, where he was a partner in KPMG's department of professional practice (2002-2004) and a Senior Manager (1999-2000). In addition, Mr. Robins served as Assistant Chief Accountant, United States Securities and Exchange Commission (2000-2002).
Robert G. Byrnes (40)
	Year of Election or Appointment: 2005 Assistant Treasurer of U.S. Treasury Money Market. Mr. Byrnes also serves as Assistant Treasurer of other Fidelity funds (2005-present) and is an employee of FMR (2005-present). Previously, Mr. Byrnes served as Vice President of FPCMS (2003-2005). Before joining Fidelity Investments, Mr. Byrnes worked at Deutsche Asset Management where he served as Vice President of the Investment Operations Group (2000-2003).
Peter L. Lydecker (53)
	Year of Election or Appointment: 2004 Assistant Treasurer of U.S. Treasury Money Market. Mr. Lydecker also serves as Assistant Treasurer of other Fidelity funds (2004) and is an employee of FMR.
Gary W. Ryan (48)
	Year of Election or Appointment: 2005 Assistant Treasurer of U.S. Treasury Money Market. Mr. Ryan also serves as Assistant Treasurer of other Fidelity funds (2005-present) and is an employee of FMR (2005-present). Previously, Mr. Ryan served as Vice President of Fund Reporting in FPCMS (1999-2005).
Salvatore Schiavone (41)
	Year of Election or Appointment: 2005 Assistant Treasurer of U.S. Treasury Money Market. Mr. Schiavone also serves as Assistant Treasurer of other Fidelity funds (2005-present) and is an employee of FMR (2005-present). Before joining Fidelity Investments, Mr. Schiavone worked at Deutsche Asset Management, where he most recently served as Assistant Treasurer (2003-2005) of the Scudder Funds and Vice President and Head of Fund Reporting (1996-2003).

Annual Report

Distributions

A total of 100% of the dividends distributed during the fiscal year was derived from interest on U.S. Government securities which is generally exempt from state income tax.

The fund designates $23,439,257 of distributions paid during the period January 1, 2007 to April 30, 2007 as qualifying to be taxed as interest-related dividends for nonresident alien shareholders.

The fund will notify shareholders in January 2008 of amounts for use in preparing 2007 income tax returns.

Annual Report

Proxy Voting Results

PROPOSAL1
To elect a Board of Trustees. ^A
	# of Votes	% of Votes
Dennis J. Dirks
Affirmative	3,218,948,197.74	96.190
Withheld	127,485,270.73	3.810
TOTAL	3,346,433,468.47	100.000
Albert R. Gamper, Jr.
Affirmative	3,215,354,397.39	96.083
Withheld	131,079,071.08	3.917
TOTAL	3,346,433,468.47	100.000
Robert M. Gates
Affirmative	3,206,365,014.21	95.814
Withheld	140,068,454.26	4.186
TOTAL	3,346,433,468.47	100.000
George H. Heilmeier
Affirmative	3,202,447,547.40	95.697
Withheld	143,985,921.07	4.303
TOTAL	3,346,433,468.47	100.000
Edward C. Johnson 3d
Affirmative	3,193,314,793.06	95.424
Withheld	153,118,675.41	4.576
TOTAL	3,346,433,468.47	100.000
Stephen P. Jonas
Affirmative	3,212,351,847.33	95.993
Withheld	134,081,621.14	4.007
TOTAL	3,346,433,468.47	100.000
James H. Keyes^B
Affirmative	3,215,401,563.53	96.084
Withheld	131,031,904.94	3.916
TOTAL	3,346,433,468.47	100.000
	# of Votes	% of Votes
Marie L. Knowles
Affirmative	3,215,966,891.46	96.101
Withheld	130,466,577.01	3.899
TOTAL	3,346,433,468.47	100.000
Ned C. Lautenbach
Affirmative	3,208,900,601.85	95.890
Withheld	137,532,866.62	4.110
TOTAL	3,346,433,468.47	100.000
William O. McCoy
Affirmative	3,201,902,631.61	95.681
Withheld	144,530,836.86	4.319
TOTAL	3,346,433,468.47	100.000
Robert L. Reynolds
Affirmative	3,217,595,027.12	96.150
Withheld	128,838,441.35	3.850
TOTAL	3,346,433,468.47	100.000
Cornelia M. Small
Affirmative	3,212,941,689.62	96.011
Withheld	133,491,778.85	3.989
TOTAL	3,346,433,468.47	100.000
William S. Stavropoulos
Affirmative	3,212,375,473.68	95.994
Withheld	134,057,994.79	4.006
TOTAL	3,346,433,468.47	100.000
Kenneth L. Wolfe
Affirmative	3,211,985,097.72	95.982
Withheld	134,448,370.75	4.018
TOTAL	3,346,433,468.47	100.000
^A Denotes trust-wide proposal and voting results. ^B Effective on or about January 1, 2007.

Annual Report

Managing Your Investments

By Phone

(phone_graphic)

Fidelity Automated
Service Telephone (FAST®)
1-800-544-5555

Press

1 For mutual fund and brokerage trading.

2 For quotes.*

3 For account balances and holdings.

4 To review orders and mutual
fund activity.

5 To change your PIN.

*0 To speak to a Fidelity representative.

By PC

Fidelity's web site on the Internet provides a wide range of information, including daily financial news, fund performance, interactive planning tools and news about Fidelity products and services.

(computer_graphic)

Fidelity's Web Site
www.fidelity.com

Annual Report

To Visit Fidelity

For directions and hours,
please call 1-800-544-9797.

Arizona

7001 West Ray Road
Chandler, AZ

15445 N. Scottsdale Road
Scottsdale, AZ

California

815 East Birch Street
Brea, CA

1411 Chapin Avenue
Burlingame, CA

851 East Hamilton Avenue
Campbell, CA

19200 Von Karman Avenue
Irvine, CA

601 Larkspur Landing Circle
Larkspur, CA

10100 Santa Monica Blvd.
Los Angeles, CA

27101 Puerta Real
Mission Viejo, CA

73-575 El Paseo
Palm Desert, CA

251 University Avenue
Palo Alto, CA

123 South Lake Avenue
Pasadena, CA

16995 Bernardo Ctr. Drive
Rancho Bernardo, CA

1220 Roseville Parkway
Roseville, CA

1740 Arden Way
Sacramento, CA

7676 Hazard Center Drive
San Diego, CA

11943 El Camino Real
San Diego, CA

8 Montgomery Street
San Francisco, CA

3793 State Street
Santa Barbara, CA

1200 Wilshire Boulevard
Santa Monica, CA

21701 Hawthorne Boulevard
Torrance, CA

2001 North Main Street
Walnut Creek, CA

6300 Canoga Avenue
Woodland Hills, CA

Colorado

1625 Broadway
Denver, CO

9185 Westview Road
Lone Tree, CO

Connecticut

48 West Putnam Avenue
Greenwich, CT

265 Church Street
New Haven, CT

300 Atlantic Street
Stamford, CT

29 South Main Street
West Hartford, CT

Delaware

400 Delaware Avenue
Wilmington, DE

Florida

4400 N. Federal Highway
Boca Raton, FL

121 Alhambra Plaza
Coral Gables, FL

2948 N. Federal Highway
Ft. Lauderdale, FL

4671 Town Center Parkway
Jacksonville, FL

1907 West State Road 434
Longwood, FL

8880 Tamiami Trail, North
Naples, FL

3501 PGA Boulevard
Palm Beach Gardens, FL

3550 Tamiami Trail, South
Sarasota, FL

1502 N. Westshore Blvd.
Tampa, FL

2465 State Road 7
Wellington, FL

Georgia

3445 Peachtree Road, N.E.
Atlanta, GA

1000 Abernathy Road
Atlanta, GA

Illinois

One North LaSalle Street
Chicago, IL

875 North Michigan Ave.
Chicago, IL

1415 West 22nd Street
Oak Brook, IL

1572 East Golf Road
Schaumburg, IL

3232 Lake Avenue
Wilmette, IL

Indiana

4729 East 82nd Street
Indianapolis, IN

Kansas

5400 College Boulevard
Overland Park, KS

Maine

Three Canal Plaza
Portland, ME

Maryland

7315 Wisconsin Avenue
Bethesda, MD

One W. Pennsylvania Ave.
Towson, MD

Massachusetts

801 Boylston Street
Boston, MA

155 Congress Street
Boston, MA

300 Granite Street
Braintree, MA

44 Mall Road
Burlington, MA

238 Main Street
Cambridge, MA

405 Cochituate Road
Framingham, MA

416 Belmont Street
Worcester, MA

Fidelity Brokerage Services, Inc., 100 Summer St., Boston, MA 02110 Member NYSE/SIPC

Annual Report

Michigan

500 E. Eisenhower Pkwy.
Ann Arbor, MI

280 Old N. Woodward Ave.
Birmingham, MI

43420 Grand River Avenue
Novi, MI

29155 Northwestern Hwy.
Southfield, MI

Minnesota

7600 France Avenue South
Edina, MN

Missouri

1524 South Lindbergh Blvd.
St. Louis, MO

Nevada

2225 Village Walk Drive
Henderson, NV

New Jersey

150 Essex Street
Millburn, NJ

56 South Street
Morristown, NJ

396 Route 17, North
Paramus, NJ

3518 Route 1 North
Princeton, NJ

530 Broad Street
Shrewsbury, NJ

New York

1055 Franklin Avenue
Garden City, NY

37 West Jericho Turnpike
Huntington Station, NY

1271 Avenue of the Americas
New York, NY

980 Madison Avenue
New York, NY

61 Broadway
New York, NY

350 Park Avenue
New York, NY

200 Fifth Avenue
New York, NY

733 Third Avenue
New York, NY

11 Penn Plaza
New York, NY

2070 Broadway
New York, NY

1075 Northern Blvd.
Roslyn, NY

799 Central Park Avenue
Scarsdale, NY

North Carolina

4611 Sharon Road
Charlotte, NC

7011 Fayetteville Road
Durham, NC

Ohio

3805 Edwards Road
Cincinnati, OH

1324 Polaris Parkway
Columbus, OH

28699 Chagrin Boulevard
Woodmere Village, OH

Oregon

7493 SW Bridgeport Road
Tigard, OR

Pennsylvania

600 West DeKalb Pike
King of Prussia, PA

1735 Market Street
Philadelphia, PA

12001 Perry Highway
Wexford, PA

Rhode Island

47 Providence Place
Providence, RI

Tennessee

6150 Poplar Avenue
Memphis, TN

Texas

10000 Research Boulevard
Austin, TX

4001 Northwest Parkway
Dallas, TX

12532 Memorial Drive
Houston, TX

2701 Drexel Drive
Houston, TX

6560 Fannin Street
Houston, TX

6500 N. MacArthur Blvd.
Irving, TX

6005 West Park Boulevard
Plano, TX

14100 San Pedro
San Antonio, TX

1576 East Southlake Blvd.
Southlake, TX

19740 IH 45 North
Spring, TX

Utah

279 West South Temple
Salt Lake City, UT

Virginia

1861 International Drive
McLean, VA

Washington

411 108th Avenue, N.E.
Bellevue, WA

1518 6th Avenue
Seattle, WA

Washington, DC

1900 K Street, N.W.
Washington, DC

Wisconsin

595 North Barker Road
Brookfield, WI

Annual Report

To Write Fidelity

We'll give your correspondence immediate attention and send you written confirmation upon completion of your request.

(letter_graphic)

Making Changes
To Your Account

(such as changing name, address, bank, etc.)

Fidelity Investments
P.O. Box 770001
Cincinnati, OH 45277-0002

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For Non-Retirement
Accounts

Buying shares

Fidelity Investments
P.O. Box 770001
Cincinnati, OH 45277-0003

Overnight Express
Fidelity Investments
Attn: Distribution Services
100 Crosby Parkway - KC1H
Covington, KY 41015

Selling shares

Fidelity Investments
P.O. Box 770001
Cincinnati, OH 45277-0035

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Fidelity Investments
Attn: Distribution Services
100 Crosby Parkway - KC1H
Covington, KY 41015

General Correspondence

Fidelity Investments
P.O. Box 500
Merrimack, NH 03054-0500

(letter_graphic)

For Retirement
Accounts

Buying shares

Fidelity Investments
P.O. Box 770001
Cincinnati, OH 45277-0003

Selling shares

Fidelity Investments
P.O. Box 770001
Cincinnati, OH 45277-0035

Overnight Express
Fidelity Investments
Attn: Distribution Services
100 Crosby Parkway - KC1H
Covington, KY 41015

General Correspondence

Fidelity Investments
P.O. Box 500
Merrimack, NH 03054-0500

Annual Report

Investment Adviser

Fidelity Management & Research
Company
Boston, MA

Investment Sub-Advisers

Fidelity Investments
Money Management, Inc.

Fidelity Research & Analysis Company
(formerly Fidelity Management &
Research (Far East) Inc.)

Fidelity International Investment Advisors

Fidelity International Investment Advisors
(U.K.) Limited

General Distributor

Fidelity Distributors Corporation

Boston, MA

Transfer and Service Agent

Fidelity Service Company, Inc.

Boston, MA

Custodian

JPMorgan Chase Bank

New York, NY

The Fidelity Telephone Connection

Mutual Fund 24-Hour Service

Exchanges/Redemptions
and Account Assistance 1-800-544-6666

Product Information 1-800-544-6666

Retirement Accounts 1-800-544-4774 (8 a.m. - 9 p.m.)

TDD Service 1-800-544-0118
for the deaf and hearing impaired
(9 a.m. - 9 p.m. Eastern time)

Fidelity Automated Service
Telephone (FAST®) (automated graphic) 1-800-544-5555

(automated graphic) Automated line for quickest service

(Fidelity Investment logo)(registered trademark)
Corporate Headquarters
82 Devonshire St., Boston, MA 02109
www.fidelity.com

TMM-UANN-0607
1.784734.104

Item 2. Code of Ethics

As of the end of the period, April 30, 2007, Fidelity Hereford Street Trust (the trust) has adopted a code of ethics, as defined in Item 2 of Form N-CSR, that applies to its President and Treasurer and its Chief Financial Officer. A copy of the code of ethics is filed as an exhibit to this Form N-CSR.

Item 3. Audit Committee Financial Expert

The Board of Trustees of the trust has determined that Marie L. Knowles is an audit committee financial expert, as defined in Item 3 of Form N-CSR. Ms. Knowles is independent for purposes of Item 3 of Form N-CSR.

Item 4. Principal Accountant Fees and Services

(a) Audit Fees.

For the fiscal years ended April 30, 2007 and April 30, 2006, the aggregate Audit Fees billed by PricewaterhouseCoopers LLP (PwC) for professional services rendered for the audits of the financial statements, or services that are normally provided in connection with statutory and regulatory filings or engagements for those fiscal years, for the Fidelity Government Money Market Fund, Fidelity Money Market Fund and Fidelity U.S. Treasury Money Market Fund (the funds) and for all funds in the Fidelity Group of Funds are shown in the table below.

Fund	2007^A	2006^A
Fidelity Government Money Market Fund	$40,000	$33,000
Fidelity Money Market Fund	$56,000	$52,000
Fidelity U.S. Treasury Money Market Fund	$43,000	$38,000
All funds in the Fidelity Group of Funds audited by PwC	$13,900,000	$12,500,000

^A	Aggregate amounts may reflect rounding.

(b) Audit-Related Fees.

In each of the fiscal years ended April 30, 2007 and April 30, 2006 the aggregate Audit-Related Fees billed by PwC for services rendered for assurance and related services to each fund that are reasonably related to the performance of the audit or review of the fund's financial statements, but not reported as Audit Fees, are shown in the table below.

Fund	2007^A	2006^A
Fidelity Government Money Market Fund	$0	$0
Fidelity Money Market Fund	$0	$0
Fidelity U.S. Treasury Money Market Fund	$0	$0

^A	Aggregate amounts may reflect rounding.

In each of the fiscal years ended April 30, 2007 and April 30, 2006, the aggregate Audit-Related Fees that were billed by PwC that were required to be approved by the Audit Committee for services rendered on behalf of Fidelity Management & Research Company (FMR) and entities controlling, controlled by, or under common control with FMR (not including any sub-adviser whose role is primarily portfolio management and is subcontracted with or overseen by another investment adviser) that provide ongoing services to the funds ("Fund Service Providers") for assurance and related services that relate directly to the operations and financial reporting of each fund that are reasonably related to the performance of the audit or review of the fund's financial statements, but not reported as Audit Fees, are shown in the table below.

Billed By	2007^A	2006^A
PwC	$0	$0

^A	Aggregate amounts may reflect rounding.

Fees included in the audit-related category comprise assurance and related services (e.g., due diligence services) that are traditionally performed by the independent registered public accounting firm. These audit-related services include due diligence related to mergers and acquisitions, accounting consultations and audits in connection with acquisitions, internal control reviews, attest services that are not required by statute or regulation and consultation concerning financial accounting and reporting standards.

In each of the fiscal years ended April 30, 2007 and April 30, 2006, the aggregate Tax Fees billed by PwC for professional services rendered for tax compliance, tax advice, and tax planning for each fund is shown in the table below.

Fund	2007^A	2006^A
Fidelity Government Money Market Fund	$1,900	$1,800
Fidelity Money Market Fund	$1,900	$1,800
Fidelity U.S. Treasury Money Market Fund	$1,900	$1,800

^A	Aggregate amounts may reflect rounding.

In each of the fiscal years ended April 30, 2007 and April 30, 2006, the aggregate Tax Fees billed by PwC that were required to be approved by the Audit Committee for professional services rendered on behalf of the Fund Service Providers for tax compliance, tax advice, and tax planning that relate directly to the operations and financial reporting of each fund is shown in the table below.

Billed By	2007^A	2006^A
PwC	$0	$0

^A	Aggregate amounts may reflect rounding.

Fees included in the Tax Fees category comprise all services performed by professional staff in the independent registered public accounting firm's tax division except those services related to the audit. Typically, this category would include fees for tax compliance, tax planning, and tax advice. Tax compliance, tax advice, and tax planning services include preparation of original and amended tax returns, claims for refund and tax payment-planning services, assistance with tax audits and appeals, tax advice related to mergers and acquisitions and requests for rulings or technical advice from taxing authorities.

(d) All Other Fees.

In each of the fiscal years ended April 30, 2007 and April 30, 2006, the aggregate Other Fees billed by PwC for all other non-audit services rendered to the funds is shown in the table below.

Fund	2007^A	2006^A
Fidelity Government Money Market Fund	$1,200	$1,400
Fidelity Money Market Fund	$4,600	$4,900
Fidelity U.S. Treasury Money Market Fund	$1,900	$2,400

^A	Aggregate amounts may reflect rounding.

In each of the fiscal years ended April 30, 2007 and April 30, 2006, the aggregate Other Fees billed by PwC that were required to be approved by the Audit Committee for all other non-audit services rendered on behalf of the Fund Service Providers that relate directly to the operations and financial reporting of each fund is shown in the table below.

Billed By	2007^A	2006^A
PwC	$170,000	$155,000

^A	Aggregate amounts may reflect rounding.

Fees included in the All Other Fees category include services related to internal control reviews, strategy and other consulting, financial information systems design and implementation, consulting on other information systems, and other tax services unrelated to the fund.

(e) (1)

Audit Committee Pre-Approval Policies and Procedures:

The trust's Audit Committee must pre-approve all audit and non-audit services provided by the independent registered public accounting firm relating to the operations or financial reporting of the funds. Prior to the commencement of any audit or non-audit services to a fund, the Audit Committee reviews the services to determine whether they are appropriate and permissible under applicable law.

The trust's Audit Committee has adopted policies and procedures to, among other purposes, provide a framework for the Committee's consideration of non-audit services by the audit firms that audit the Fidelity funds. The policies and procedures require that any non-audit service provided by a fund audit firm to a Fidelity Fund and any non-audit service provided by a fund auditor to a Fund Service Provider that relates directly to the operations and financial reporting of a Fidelity fund (Covered Service) are subject to approval by the Audit Committee before such service is provided. Non-audit services provided by a fund audit firm for a Fund Service Provider that do not relate directly to the operations and financial reporting of a Fidelity fund (Non-Covered Service) but that are expected to exceed $50,000 are also subject to pre-approval by the Audit Committee.

All Covered Services, as well as Non-Covered Services that are expected to exceed $50,000, must be approved in advance of provision of the service either: (i) by formal resolution of the Audit Committee, or (ii) by oral or written approval of the service by the Chair of the Audit Committee (or if the Chair is unavailable, such other member of the Audit Committee as may be designated by the Chair to act in the Chair's absence). The approval contemplated by (ii) above is permitted where the Treasurer determines that action on such an engagement is necessary before the next meeting of the Audit Committee. Neither pre-approval nor advance notice of Non-Covered Service engagements for which fees are not expected to exceed $50,000 is required; such engagements are to be reported to the Audit Committee monthly.

(e) (2)

Services approved pursuant to paragraph (c)(7)(i)(C) of Rule 2-01 of Regulation S-X:

Audit-Related Fees:

There were no amounts that were approved by the Audit Committee pursuant to the de minimis exception for the fiscal years ended April 30, 2007 and April 30, 2006 on behalf of each fund.

There were no amounts that were required to be approved by the Audit Committee pursuant to the de minimis exception for the fiscal years ended April 30, 2007 and April 30, 2006 on behalf of the Fund Service Providers that relate directly to the operations and financial reporting of each fund.

Tax Fees:

There were no amounts that were approved by the Audit Committee pursuant to the de minimis exception for the fiscal years ended April 30, 2007 and April 30, 2006 on behalf of each fund.

All Other Fees:

There were no amounts that were approved by the Audit Committee pursuant to the de minimis exception for the fiscal years ended April 30, 2007 and April 30, 2006 on behalf of each fund.

(f) Not applicable.

(g) For the fiscal years ended April 30, 2007 and April 30, 2006, the aggregate fees billed by PwC of $1,345,000^A and $1,100,000^A for non-audit services rendered on behalf of the funds, FMR (not including any sub-adviser whose role is primarily portfolio management and is subcontracted with or overseen by another investment adviser) and Fund Service Providers relating to Covered Services and Non-Covered Services are shown in the table below.

	2007^A	2006^A
Covered Services	$185,000	$170,000
Non-Covered Services	$1,160,000	$930,000

^A	Aggregate amounts may reflect rounding.

(h) The trust's Audit Committee has considered Non-Covered Services that were not pre-approved that were provided by PwC to Fund Service Providers to be compatible with maintaining the independence of PwC in its audit of the funds, taking into account representations from PwC, in accordance with Independence Standards Board Standard No.1, regarding its independence from the funds and their related entities.

Item 5. Audit Committee of Listed Registrants

Not applicable.

Item 6. Schedule of Investments

Not applicable.

Item 7. Disclosure of Proxy Voting Policies and Procedures for Closed-End Management Investment Companies

Not applicable.

Item 8. Portfolio Managers of Closed-End Management Investment Companies

Not applicable.

Item 9. Purchase of Equity Securities by Closed-End Management Investment Company and Affiliated Purchasers

Not applicable.

Item 10. Submission of Matters to a Vote of Security Holders

There were no material changes to the procedures by which shareholders may recommend nominees to the trust's Board of Trustees.

Item 11. Controls and Procedures

(a)(i) The President and Treasurer and the Chief Financial Officer have concluded that the trust's disclosure controls and procedures (as defined in Rule 30a-3(c) under the Investment Company Act) provide reasonable assurances that material information relating to the trust is made known to them by the appropriate persons, based on their evaluation of these controls and procedures as of a date within 90 days of the filing date of this report.

(a)(ii) There was no change in the trust's internal control over financial reporting (as defined in Rule 30a-3(d) under the Investment Company Act) that occurred during the second fiscal quarter of the period covered by this report that has materially affected, or is reasonably likely to materially affect, the trust's internal control over financial reporting.

Item 12. Exhibits

(a)	(1)	Code of Ethics pursuant to Item 2 of Form N-CSR is filed and attached hereto as EX-99.CODE ETH.
(a)	(2)	Certification pursuant to Rule 30a-2(a) under the Investment Company Act of 1940 (17 CFR 270.30a-2(a)) is filed and attached hereto as Exhibit 99.CERT.
(a)	(3)	Not applicable.
(b)		Certification pursuant to Rule 30a-2(b) under the Investment Company Act of 1940 (17 CFR 270.30a-2(b)) is furnished and attached hereto as Exhibit 99.906CERT.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Fidelity Hereford Street Trust

By:	/s/Kimberley Monasterio
	Kimberley Monasterio
	President and Treasurer

Date:	June 14, 2007

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.

By:	/s/Kimberley Monasterio
	Kimberley Monasterio
	President and Treasurer

Date:	June 14, 2007

By:	/s/Joseph B. Hollis
	Joseph B. Hollis
	Chief Financial Officer

Date:	June 14, 2007

Money Market

Contents

Chairman's Message

Shareholder Expense Example

Investment Changes/Performance

Investments April 30, 2007

Financial Statements

Notes to Financial Statements

Report of Independent Registered Public Accounting Firm

Trustees and Officers

Distributions

Proxy Voting Results

Managing Your Investments

Fidelity® Government Money Market Fund

Contents

Chairman's Message

Shareholder Expense Example

Investment Changes/Performance

Investments April 30, 2007

Financial Statements

Notes to Financial Statements

Report of Independent Registered Public Accounting Firm

Trustees and Officers

Distributions

Proxy Voting Results

Managing Your Investments

To Visit Fidelity

U.S. Treasury Money Market Fund

Contents

Chairman's Message

Shareholder Expense Example

Investment Changes/Performance

Investments April 30, 2007

Financial Statements

Notes to Financial Statements

Report of Independent Registered Public Accounting Firm

Trustees and Officers

Distributions

Proxy Voting Results

Managing Your Investments

To Visit Fidelity

To Write Fidelity

Fidelity® Government Money
Market Fund

U.S. Treasury
Money Market Fund