485BPOS

As filed with the U.S. Securities and Exchange Commission on January 20, 2012

File No. 033-47287

File No. 811-06637

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C.  20549

FORM N-1A

REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933	x
Pre-Effective Amendment No.	o
Post-Effective Amendment No. 94	x
and/or
REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940	x
Amendment No. 95

(Check appropriate box or boxes.)

THE UBS FUNDS

(Exact Name of Registrant as Specified in Charter)

One North Wacker, Chicago, Illinois  60606

(Address of Principal Executive Office) (Zip Code)

Registrant’s Telephone Number, including Area Code  (312) 525-7100

Mark F. Kemper
UBS Global Asset Management
One North Wacker
Chicago, Illinois  60606

(Name and Address of Agent for Service)

Please send copies of all communications to:

Bruce G. Leto, Esq.
Stradley, Ronon, Stevens & Young, LLP
2600 One Commerce Square
Philadelphia, PA 19103
(215) 564-8027

Approximate Date of Proposed Public Offering: As soon as practicable after the effective date of this registration statement.

It is proposed that this filing will become effective (check appropriate box):

ximmediately upon filing pursuant to paragraph (b)

oon [Date] pursuant to paragraph (b)

o60 days after filing pursuant to paragraph (a)(1)

oon [Date] pursuant to paragraph (a)(1)

o75 days after filing pursuant to paragraph (a)(2)

oon [Date] pursuant to paragraph (a)(2) of Rule 485.

If appropriate, check the following box:

oThis post-effective amendment designates a new effective date for a previously filed post-effective amendment.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, as amended (the “Securities Act”) and the Investment Company Act of 1940, as amended, the Registrant certifies that it meets all of the requirements for effectiveness of this registration statement under Rule 485(b) under the Securities Act and has duly caused Post-Effective Amendment Nos. 94/95 to this registration statement to be signed on its behalf by the undersigned, duly authorized, in the City of New York, and the State of New York on the 20th day of January, 2012.

THE UBS FUNDS
By:	Mark E. Carver*
	Mark E. Carver
	President and Principal Executive Officer

Pursuant to the requirements of the Securities Act, this Registration Statement has been signed below by the following persons in the capacities and on the dates indicated:

Signature	Title	Date
Mark E. Carver*	President and Principal	January 20, 2012
Mark E. Carver	Executive Officer
Frank K. Reilly*	Chairman and	January 20, 2012
Frank K. Reilly	Trustee
Shawn Lytle*	Trustee	January 20, 2012
Shawn Lytle
Edward M. Roob*	Trustee	January 20, 2012
Edward M. Roob
Adela Cepeda*	Trustee	January 20, 2012
Adela Cepeda
J. Mikesell Thomas*	Trustee	January 20, 2012
J. Mikesell Thomas
Abbie J. Smith*	Trustee	January 20, 2012
Abbie J. Smith
John J. Murphy*	Trustee	January 20, 2012
John J. Murphy
Thomas Disbrow*	Treasurer and Principal	January 20, 2012
Thomas Disbrow	Accounting Officer

* By:	/s/ Joseph J. Allessie
	Joseph J. Allessie, Attorney-in-Fact
	(Pursuant to Powers of Attorney incorporated herein by reference.)

INDEX TO EXHIBITS

Exhibit No.	Exhibit
EX-101.INS	XBRL Instance Document
EX-101.SCH	XBRL Taxonomy Extension Schema Document
EX-101.CAL	XBRL Taxonomy Extension Calculation Linkbase
EX-101.DEF	XBRL Taxonomy Extension Definition Linkbase
EX-101.LAB	XBRL Taxonomy Extension Labels Linkbase
EX-101.PRE	XBRL Taxonomy Extension Presentation Linkbase

XML

Label	Element	Value
Risk Return [Abstract]	rr_RiskReturnAbstract
ProspectusDate	rr_ProspectusDate	Dec. 30, 2011
UBS U.S. Equity Opportunity Fund (Prospectus Summary) | UBS U.S. Equity Opportunity Fund
Risk Return [Abstract]	rr_RiskReturnAbstract
Risk/Return, Heading	rr_RiskReturnHeading	UBS U.S. Equity Opportunity Fund (formerly, UBS U.S. Large Cap Value Equity Fund)
Investment Objective, Heading	rr_ObjectiveHeading	Investment objective
investment Objective, Primary	rr_ObjectivePrimaryTextBlock	The Fund seeks to maximize total return, consisting of capital appreciation and current income.
Expense, Heading	rr_ExpenseHeading	Fees and expenses
Expense, Narrative	rr_ExpenseNarrativeTextBlock	These tables describe the fees and expenses that you may pay if you buy and hold shares of the Fund. You may qualify for a sales charge waiver or discount if you and your family invest, or agree to invest in the future, at least $50,000 in the Fund. More information about these and other discounts and waivers, as well as eligibility requirements for each share class, is available from your financial advisor and in "Managing your fund account" on page 9 of the Fund's prospectus and in "Reduced sales charges, additional purchase, exchange and redemption information and other services" on page 54 of the Fund's statement of additional information ("SAI").
Shareholder Fees, Caption	rr_ShareholderFeesCaption	Shareholder fees (fees paid directly from your investment)
Operating Expenses, Caption	rr_OperatingExpensesCaption	Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover, Heading	rr_PortfolioTurnoverHeading	Portfolio turnover
Portfolio Turnover	rr_PortfolioTurnoverTextBlock	The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 85% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	85.00%
Expense Breakpoint, Discounts	rr_ExpenseBreakpointDiscounts	You may qualify for a sales charge waiver or discount if you and your family invest, or agree to invest in the future, at least $50,000 in the Fund.
Expense Breakpoint, Minimum Investment Required Amount	rr_ExpenseBreakpointMinimumInvestmentRequiredAmount	50,000
Expense Example, Heading	rr_ExpenseExampleHeading	Example
Expense Example, Narrative	rr_ExpenseExampleNarrativeTextBlock	This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated and then sell all of your shares at the end of those periods unless otherwise stated. The example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. The costs described in the example reflect the expenses of the Fund that would result from the contractual fee waiver and expense reimbursement agreement with the Advisor for the first year only. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:
Investment Strategy, Heading	rr_StrategyHeading	Principal strategies
Investment Strategy, Narrative	rr_StrategyNarrativeTextBlock	Principal investments Under normal circumstances, the Fund invests at least 80% of its net assets (plus borrowings for investment purposes, if any) in equity securities of US companies. The Fund primarily invests in large capitalization companies, but may invest in companies of any size. The Fund may invest up to 20% of its net assets in securities of foreign companies in both developed and emerging markets. Investments in equity securities may include, but are not limited to, dividend-paying securities, common stock, preferred stock, shares of investment companies, convertible securities, warrants and rights. The Fund may, but is not required to, use exchange-traded or over-the-counter derivative instruments for risk management purposes or as part of the Fund's investment strategies. The derivatives in which the Fund may invest include futures on indices or currencies and foward currency agreements, which may be used for risk management purposes to manage or adjust the risk profile of the Fund. Futures on currencies and forward currency agreements may also be used to hedge against a specific currency. In addition, futures on indices may be used for investment (non-hedging) purposes to earn income; to enhance returns; to replace more traditional direct investments; or to obtain exposure to certain markets. Management process In selecting securities, the Advisor focuses on, among other things, identifying discrepancies between a security's fundamental value and its market price. In this context, the fundamental value of a given security is the Advisor's assessment of what a security is worth. The Fund will select a security whose fundamental value it estimates to be greater than its market value at any given time. For each stock under analysis, the Advisor bases its estimates of value upon economic, industry and company analysis, as well as upon a company's management team, competitive advantage and core competencies. The Advisor then compares its assessment of a security's value against the prevailing market prices with the aim of constructing a focused portfolio of stocks with attractive relative price/value characteristics. Although the Fund is a diversified fund under the Investment Company Act of 1940, the Fund employs a focused investment strategy that may result in the Fund investing in a lesser number of issuers than other equity mutual funds.
Risk, Heading	rr_RiskHeading	Main risks
Risk, Narrative	rr_RiskNarrativeTextBlock	All investments carry a certain amount of risk and the Fund cannot guarantee that it will achieve its investment objective. You may lose money by investing in the Fund. An investment in the Fund is not a deposit of the bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Below are some of the specific risks of investing in the Fund. Market risk: The market value of the Fund's investments may fluctuate, sometimes rapidly or unpredictably, as the stock and bond markets fluctuate. Market risk may affect a single issuer, industry, or sector of the economy, or it may affect the market as a whole. Management risk: The risk that the investment strategies, techniques and risk analyses employed by the Advisor may not produce the desired results. Foreign investing risk: The value of the Fund's investments in foreign securities may fall due to adverse political, social and economic developments abroad and due to decreases in foreign currency values relative to the US dollar. Investments in foreign government bonds involve special risks because the Fund may have limited legal recourse in the event of default. Also, foreign securities are sometimes less liquid and more difficult to sell and to value than securities of US issuers. These risks are greater for investments in emerging market issuers. In addition, investments in emerging market is suers may decline in value because of unfavorable foreign government actions, greater risks of political instability or the absence of accurate information about emerging market issuers. Limited capitalization risk: The risk that securities of smaller capitalization companies tend to be more volatile and less liquid than securities of larger capitalization companies. This can have a disproportionate effect on the market price of smaller capitalization companies and affect the Fund's ability to purchase or sell these securities. In general, smaller capitalization companies are more vulnerable than larger companies to adverse business or economic developments and they may have more limited resources. Limited number of issuers risk: The Fund may invest in a limited number of issuers compared to other mutual funds and, consequently, may invest a greater portion of its assets in one or more issuers than other mutual funds. The Fund, therefore, may be more sensitive to a single economic, business, political, regulatory or other occurrence, which may result in greater fluctuation in the value of the Fund's shares and to a greater risk of loss. Derivatives risk: The value of "derivatives"--so called because their value "derives" from the value of an underlying asset, reference rate or index--may rise or fall more rapidly than other investments. When using derivatives for non-hedging purposes, it is possible for the Fund to lose more than the amount it invested in the derivative. The risks of investing in derivative instruments also include market and management risks. In addition, non-exchange traded derivatives may be subject to liquidity risk, credit risk and mispricing or valuation complexity. These derivatives risks are different from, and may be greater than, the risks associated with investing directly in securities and other instruments. Leverage risk associated with financial instruments: The use of financial instruments to increase potential returns, including derivatives used for investment (non-hedging) purposes, may cause the Fund to be more volatile than if it had not been leveraged. The use of leverage may also accelerate the velocity of losses and can result in losses to the Fund that exceed the amount originally invested.
Risk, Lose Money	rr_RiskLoseMoney	You may lose money by investing in the Fund.
Risk, Not Insured Depository Institution	rr_RiskNotInsuredDepositoryInstitution	An investment in the Fund is not a deposit of the bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Bar Chart and Performance Table, Heading	rr_BarChartAndPerformanceTableHeading	Performance
Performance, Narrative	rr_PerformanceNarrativeTextBlock	Risk/return bar chart and table The performance information that follows shows the Fund's performance information in a bar chart and an average annual total returns table. The information provides some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year and by showing how the Fund's average annual total returns compare with those of a broad measure of market performance. Index reflects no deduction for fees, expenses or taxes. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. On December 30, 2011, the Fund's investment strategy, including its 80% policy, changed. The performance information below, prior to that date, is attributable to the Fund's previous investment strategy. Updated performance for the Fund is available at http://globalam-us.ubs.com/corpweb/performance.do. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor's tax situation and may differ from those shown. In addition, the after-tax returns shown are not relevant to investors who hold Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns for other classes will vary from the Class Y shares' after-tax returns shown.
Performance, Information Illustrates Variability of Returns	rr_PerformanceInformationIllustratesVariabilityOfReturns	The performance information that follows shows the Fund's performance information in a bar chart and an average annual total returns table. The information provides some indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year and by showing how the Fund's average annual total returns compare with those of a broad measure of market performance.
Performance, Availability Website Address	rr_PerformanceAvailabilityWebSiteAddress	http://globalam-us.ubs.com/corpweb/performance.do
Performance, Past Does Not Indicate Future	rr_PerformancePastDoesNotIndicateFuture	The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart, Heading	rr_BarChartHeading	UBS U.S. Equity Opportunity Fund Annual Total Returns of Class Y Shares (2002 is the Fund’s first full year of operations)
Bar Chart, Closing	rr_BarChartClosingTextBlock	Total return January 1 - September 30, 2011: (15.30)% Best quarter during calendar years shown -- 2Q 2009: 19.76% Worst quarter during calendar years shown -- 4Q 2008: (25.45)%
Index No Deduction for Fees, Expenses, Taxes	rr_IndexNoDeductionForFeesExpensesTaxes	Index reflects no deduction for fees, expenses or taxes.
Performance Table, Uses Highest Federal Rate	rr_PerformanceTableUsesHighestFederalRate	After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor's tax situation and may differ from those shown.
Performance Table, Not Relevant to Tax Deferred	rr_PerformanceTableNotRelevantToTaxDeferred	In addition, the after-tax returns shown are not relevant to investors who hold Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table, One Class of after Tax Shown	rr_PerformanceTableOneClassOfAfterTaxShown	After-tax returns for other classes will vary from the Class Y shares' after-tax returns shown.
Average Annual Returns, Caption	rr_AverageAnnualReturnCaption	Average annual total returns (for the periods ended December 31, 2010)
UBS U.S. Equity Opportunity Fund (Prospectus Summary) | UBS U.S. Equity Opportunity Fund | Russell 1000 Index
Risk Return [Abstract]	rr_RiskReturnAbstract
Average Annual Returns, Label	rr_AverageAnnualReturnLabel	Russell 1000 Index	[1]
Average Annual Returns, 1 Year	rr_AverageAnnualReturnYear01	16.10%
Average Annual Returns, 5 Years	rr_AverageAnnualReturnYear05	2.59%
Average Annual Returns, Since Inception	rr_AverageAnnualReturnSinceInception		[2]
UBS U.S. Equity Opportunity Fund (Prospectus Summary) | UBS U.S. Equity Opportunity Fund | Russell 1000 Value Index
Risk Return [Abstract]	rr_RiskReturnAbstract
Average Annual Returns, Label	rr_AverageAnnualReturnLabel	Russell 1000 Value Index
Average Annual Returns, 1 Year	rr_AverageAnnualReturnYear01	15.51%
Average Annual Returns, 5 Years	rr_AverageAnnualReturnYear05	1.28%
Average Annual Returns, Since Inception	rr_AverageAnnualReturnSinceInception		[2]
UBS U.S. Equity Opportunity Fund (Prospectus Summary) | UBS U.S. Equity Opportunity Fund | CLASS A
Risk Return [Abstract]	rr_RiskReturnAbstract
Maximum front-end sales charge (load) imposed on purchases (as a % of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	5.50%
Maximum contingent deferred sales charge (load) (CDSC) (as a % of purchase or sales price, whichever is less)	rr_MaximumDeferredSalesChargeOverOfferingPrice	none
Redemption fee (as a % of amount redeemed within 90 days of purchase, if applicable)	rr_RedemptionFeeOverRedemption	(1.00%)
Management fees	rr_ManagementFeesOverAssets	0.70%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other expenses	rr_OtherExpensesOverAssets	0.66%
Acquired fund fees and expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.01%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.62%	[3]
Less management fee waiver/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.41%)
Total annual fund operating expenses after management fee waiver/expense reimbursements	rr_NetExpensesOverAssets	1.21%	[3],[4]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-10-27
Expense Example, With Redemption, 1 Year	rr_ExpenseExampleYear01	667
Expense Example, With Redemption, 3 Years	rr_ExpenseExampleYear03	995
Expense Example, With Redemption, 5 Years	rr_ExpenseExampleYear05	1,346
Expense Example, With Redemption, 10 Years	rr_ExpenseExampleYear10	2,334
Average Annual Returns, Label	rr_AverageAnnualReturnLabel	Class A Return before taxes
Average Annual Returns, 1 Year	rr_AverageAnnualReturnYear01	4.46%
Average Annual Returns, 5 Years	rr_AverageAnnualReturnYear05	(1.96%)
Average Annual Returns, Since Inception	rr_AverageAnnualReturnSinceInception	2.47%
Average Annual Returns, Inception Date	rr_AverageAnnualReturnInceptionDate	Dec. 07, 2001
UBS U.S. Equity Opportunity Fund (Prospectus Summary) | UBS U.S. Equity Opportunity Fund | CLASS B
Risk Return [Abstract]	rr_RiskReturnAbstract
Maximum front-end sales charge (load) imposed on purchases (as a % of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum contingent deferred sales charge (load) (CDSC) (as a % of purchase or sales price, whichever is less)	rr_MaximumDeferredSalesChargeOverOfferingPrice	5.00%
Redemption fee (as a % of amount redeemed within 90 days of purchase, if applicable)	rr_RedemptionFeeOverRedemption	(1.00%)
Management fees	rr_ManagementFeesOverAssets	0.70%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other expenses	rr_OtherExpensesOverAssets	0.78%
Acquired fund fees and expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.01%
Total annual fund operating expenses	rr_ExpensesOverAssets	2.49%	[3]
Less management fee waiver/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.53%)
Total annual fund operating expenses after management fee waiver/expense reimbursements	rr_NetExpensesOverAssets	1.96%	[3],[4]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-10-27
Expense Example, With Redemption, 1 Year	rr_ExpenseExampleYear01	699
Expense Example, With Redemption, 3 Years	rr_ExpenseExampleYear03	1,025
Expense Example, With Redemption, 5 Years	rr_ExpenseExampleYear05	1,478
Expense Example, With Redemption, 10 Years	rr_ExpenseExampleYear10	2,373
Expense Example, No Redemption, 1 Year	rr_ExpenseExampleNoRedemptionYear01	199
Expense Example, No Redemption, 3 Years	rr_ExpenseExampleNoRedemptionYear03	725
Expense Example, No Redemption, 5 Years	rr_ExpenseExampleNoRedemptionYear05	1,278
Expense Example, No Redemption, 10 Years	rr_ExpenseExampleNoRedemptionYear10	2,373
Average Annual Returns, Label	rr_AverageAnnualReturnLabel	Class B Return before taxes
Average Annual Returns, 1 Year	rr_AverageAnnualReturnYear01	4.74%
Average Annual Returns, 5 Years	rr_AverageAnnualReturnYear05	(1.83%)
Average Annual Returns, Since Inception	rr_AverageAnnualReturnSinceInception	2.96%
Average Annual Returns, Inception Date	rr_AverageAnnualReturnInceptionDate	Nov. 08, 2001
UBS U.S. Equity Opportunity Fund (Prospectus Summary) | UBS U.S. Equity Opportunity Fund | CLASS C
Risk Return [Abstract]	rr_RiskReturnAbstract
Maximum front-end sales charge (load) imposed on purchases (as a % of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum contingent deferred sales charge (load) (CDSC) (as a % of purchase or sales price, whichever is less)	rr_MaximumDeferredSalesChargeOverOfferingPrice	1.00%
Redemption fee (as a % of amount redeemed within 90 days of purchase, if applicable)	rr_RedemptionFeeOverRedemption	(1.00%)
Management fees	rr_ManagementFeesOverAssets	0.70%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other expenses	rr_OtherExpensesOverAssets	0.70%
Acquired fund fees and expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.01%
Total annual fund operating expenses	rr_ExpensesOverAssets	2.41%	[3]
Less management fee waiver/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.45%)
Total annual fund operating expenses after management fee waiver/expense reimbursements	rr_NetExpensesOverAssets	1.96%	[3],[4]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-10-27
Expense Example, With Redemption, 1 Year	rr_ExpenseExampleYear01	299
Expense Example, With Redemption, 3 Years	rr_ExpenseExampleYear03	709
Expense Example, With Redemption, 5 Years	rr_ExpenseExampleYear05	1,245
Expense Example, With Redemption, 10 Years	rr_ExpenseExampleYear10	2,712
Expense Example, No Redemption, 1 Year	rr_ExpenseExampleNoRedemptionYear01	199
Expense Example, No Redemption, 3 Years	rr_ExpenseExampleNoRedemptionYear03	709
Expense Example, No Redemption, 5 Years	rr_ExpenseExampleNoRedemptionYear05	1,245
Expense Example, No Redemption, 10 Years	rr_ExpenseExampleNoRedemptionYear10	2,712
Average Annual Returns, Label	rr_AverageAnnualReturnLabel	Class C Return before taxes	[5]
Average Annual Returns, 1 Year	rr_AverageAnnualReturnYear01	8.49%
Average Annual Returns, 5 Years	rr_AverageAnnualReturnYear05	(1.58%)
Average Annual Returns, Since Inception	rr_AverageAnnualReturnSinceInception	2.61%
Average Annual Returns, Inception Date	rr_AverageAnnualReturnInceptionDate	Dec. 12, 2001
UBS U.S. Equity Opportunity Fund (Prospectus Summary) | UBS U.S. Equity Opportunity Fund | CLASS Y
Risk Return [Abstract]	rr_RiskReturnAbstract
Maximum front-end sales charge (load) imposed on purchases (as a % of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum contingent deferred sales charge (load) (CDSC) (as a % of purchase or sales price, whichever is less)	rr_MaximumDeferredSalesChargeOverOfferingPrice	none
Redemption fee (as a % of amount redeemed within 90 days of purchase, if applicable)	rr_RedemptionFeeOverRedemption	(1.00%)
Management fees	rr_ManagementFeesOverAssets	0.70%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.78%
Acquired fund fees and expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.01%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.49%	[3]
Less management fee waiver/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.53%)
Total annual fund operating expenses after management fee waiver/expense reimbursements	rr_NetExpensesOverAssets	0.96%	[3],[4]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-10-27
Expense Example, With Redemption, 1 Year	rr_ExpenseExampleYear01	98
Expense Example, With Redemption, 3 Years	rr_ExpenseExampleYear03	419
Expense Example, With Redemption, 5 Years	rr_ExpenseExampleYear05	763
Expense Example, With Redemption, 10 Years	rr_ExpenseExampleYear10	1,734
Annual Return 2002	rr_AnnualReturn2002	(15.56%)
Annual Return 2003	rr_AnnualReturn2003	30.85%
Annual Return 2004	rr_AnnualReturn2004	14.25%
Annual Return 2005	rr_AnnualReturn2005	10.00%
Annual Return 2006	rr_AnnualReturn2006	18.57%
Annual Return 2007	rr_AnnualReturn2007	0.47%
Annual Return 2008	rr_AnnualReturn2008	(40.09%)
Annual Return 2009	rr_AnnualReturn2009	23.00%
Annual Return 2010	rr_AnnualReturn2010	10.92%
Year to Date Return, Label	rr_YearToDateReturnLabel	Total return January 1 - September 30, 2011:
Bar Chart, Year to Date Return, Date	rr_BarChartYearToDateReturnDate	Sep. 30, 2011
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	(15.30%)
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Best quarter during calendar years shown
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Jun. 30, 2009
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	19.76%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Worst quarter during calendar years shown
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2008
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(25.45%)
Average Annual Returns, Label	rr_AverageAnnualReturnLabel	Class Y Return before taxes
Average Annual Returns, 1 Year	rr_AverageAnnualReturnYear01	10.92%
Average Annual Returns, 5 Years	rr_AverageAnnualReturnYear05	(0.53%)
Average Annual Returns, Since Inception	rr_AverageAnnualReturnSinceInception	3.19%
Average Annual Returns, Inception Date	rr_AverageAnnualReturnInceptionDate	Jun. 29, 2001
UBS U.S. Equity Opportunity Fund (Prospectus Summary) | UBS U.S. Equity Opportunity Fund | CLASS Y | After Taxes on Distributions
Risk Return [Abstract]	rr_RiskReturnAbstract
Average Annual Returns, Label	rr_AverageAnnualReturnLabel	Class Y Return after taxes on distributions
Average Annual Returns, 1 Year	rr_AverageAnnualReturnYear01	10.73%
Average Annual Returns, 5 Years	rr_AverageAnnualReturnYear05	(1.72%)
Average Annual Returns, Since Inception	rr_AverageAnnualReturnSinceInception	2.01%
Average Annual Returns, Inception Date	rr_AverageAnnualReturnInceptionDate	Jun. 29, 2001
UBS U.S. Equity Opportunity Fund (Prospectus Summary) | UBS U.S. Equity Opportunity Fund | CLASS Y | After Taxes on Distributions and Sales
Risk Return [Abstract]	rr_RiskReturnAbstract
Average Annual Returns, Label	rr_AverageAnnualReturnLabel	Class Y Return after taxes on distributions and sale of fund shares
Average Annual Returns, 1 Year	rr_AverageAnnualReturnYear01	7.34%
Average Annual Returns, 5 Years	rr_AverageAnnualReturnYear05	(0.47%)
Average Annual Returns, Since Inception	rr_AverageAnnualReturnSinceInception	2.68%
Average Annual Returns, Inception Date	rr_AverageAnnualReturnInceptionDate	Jun. 29, 2001

[1] Effective December 30, 2011, the Fund's performance benchmark changed from the Russell 1000 Value Index to the Russell 1000 Index in connection with changes to the Fund's investment strategies effective on that date.

[2] Average annual total returns for the Russell 1000 Index for the life of each class were as follows: Class A--3.44%; Class B--3.86%; Class C--3.65%; Class Y--2.71%. Average annual total returns for the Russell 1000 Value Index for the life of each class were as follows: Class A--4.30%; Class B--4.65%; Class C--4.50%; Class Y--3.57%.

[3] Since the "Acquired fund fees and expenses" are not directly borne by the Fund, they are not reflected in the Fund's financial statements, and therefore the amounts listed in "Total annual fund operating expenses" and "Total annual fund operating expenses after management fee waiver/expense reimbursements" will differ from those presented in the Financial highlights.

[4] The Trust, with respect to the Fund, and UBS Global Asset Management (Americas) Inc., the Fund's investment advisor ("UBS Global AM (Americas)" or the "Advisor"), have entered into a written agreement pursuant to which the Advisor has agreed to waive a portion of its management fees and/or to reimburse expenses (excluding expenses incurred through investment in other investment companies, interest, taxes, brokerage commissions and extraordinary expenses) to the extent necessary so that the Fund's ordinary operating expenses (excluding expenses incurred through investment in other investment companies, interest, taxes, brokerage commissions and extraordinary expenses), through the period ending October 27, 2013, do not exceed 1.20% for Class A shares, 1.95% for Class B shares, 1.95% for Class C shares and 0.95% for Class Y shares. Pursuant to the written agreement, the Advisor is entitled to be reimbursed for any fees it waives and expenses it reimburses for a period of three years following such fee waivers and expense reimbursements to the extent that such reimbursement of the Advisor by the Fund will not cause the Fund to exceed any applicable expense limit that is in place for the Fund.

[5] Prior to September 30, 2003, Class C shares were subject to a maximum front-end sales charge of 1.00%; this front-end sales charge is not reflected in the average annual total returns presented for the Class C shares shown above.

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UBS U.S. Equity Opportunity Fund (Prospectus Summary) | UBS U.S. Equity Opportunity Fund

UBS U.S. Equity Opportunity Fund (formerly, UBS U.S. Large Cap Value Equity Fund)

Investment objective

The Fund seeks to maximize total return, consisting of capital appreciation and

current income.

Fees and expenses

These tables describe the fees and expenses that you may pay if you buy and hold

shares of the Fund. You may qualify for a sales charge waiver or discount if you

and your family invest, or agree to invest in the future, at least $50,000 in

the Fund. More information about these and other discounts and waivers, as well

as eligibility requirements for each share class, is available from your

financial advisor and in "Managing your fund account" on page 9 of the Fund's

prospectus and in "Reduced sales charges, additional purchase, exchange and

redemption information and other services" on page 54 of the Fund's statement of

additional information ("SAI").

Shareholder fees (fees paid directly from your investment)

Shareholder Fees UBS U.S. Equity Opportunity Fund	CLASS A	CLASS B	CLASS C	CLASS Y
Maximum front-end sales charge (load) imposed on purchases (as a % of offering price)	5.50%	none	none	none
Maximum contingent deferred sales charge (load) (CDSC) (as a % of purchase or sales price, whichever is less)	none	5.00%	1.00%	none
Redemption fee (as a % of amount redeemed within 90 days of purchase, if applicable)	1.00%	1.00%	1.00%	1.00%

Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses UBS U.S. Equity Opportunity Fund		CLASS A	CLASS B	CLASS C	CLASS Y
Management fees		0.70%	0.70%	0.70%	0.70%
Distribution and/or service (12b-1) fees		0.25%	1.00%	1.00%	none
Other expenses		0.66%	0.78%	0.70%	0.78%
Acquired fund fees and expenses		0.01%	0.01%	0.01%	0.01%
Total annual fund operating expenses	[1]	1.62%	2.49%	2.41%	1.49%
Less management fee waiver/expense reimbursements		0.41%	0.53%	0.45%	0.53%
Total annual fund operating expenses after management fee waiver/expense reimbursements	[1][2]	1.21%	1.96%	1.96%	0.96%

Example

This example is intended to help you compare the cost of investing in the Fund

with the cost of investing in other mutual funds. The example assumes that you

invest $10,000 in the Fund for the time periods indicated and then sell all of

your shares at the end of those periods unless otherwise stated. The example

also assumes that your investment has a 5% return each year and that the Fund's

operating expenses remain the same. The costs described in the example reflect

the expenses of the Fund that would result from the contractual fee waiver and

expense reimbursement agreement with the Advisor for the first year only.

Although your actual costs may be higher or lower, based on these assumptions,

your costs would be:

Expense Example UBS U.S. Equity Opportunity Fund (USD $)	Expense Example, With Redemption, 1 Year	Expense Example, With Redemption, 3 Years	Expense Example, With Redemption, 5 Years	Expense Example, With Redemption, 10 Years
CLASS A	667	995	1,346	2,334
CLASS B	699	1,025	1,478	2,373
CLASS C	299	709	1,245	2,712
CLASS Y	98	419	763	1,734

Expense Example, No Redemption UBS U.S. Equity Opportunity Fund (USD $)	Expense Example, No Redemption, 1 Year	Expense Example, No Redemption, 3 Years	Expense Example, No Redemption, 5 Years	Expense Example, No Redemption, 10 Years
CLASS B	199	725	1,278	2,373
CLASS C	199	709	1,245	2,712

Portfolio turnover

The Fund pays transaction costs, such as commissions, when it buys and sells

securities (or "turns over" its portfolio). A higher portfolio turnover rate may

indicate higher transaction costs and may result in higher taxes when Fund

shares are held in a taxable account. These costs, which are not reflected in

annual fund operating expenses or in the example, affect the Fund's performance.

During the most recent fiscal year, the Fund's portfolio turnover rate was 85%

of the average value of its portfolio.

Principal strategies

Principal investments



Under normal circumstances, the Fund invests at least 80% of its net assets

(plus borrowings for investment purposes, if any) in equity securities of US

companies. The Fund primarily invests in large capitalization companies, but may

invest in companies of any size. The Fund may invest up to 20% of its net assets

in securities of foreign companies in both developed and emerging markets.

Investments in equity securities may include, but are not limited to,

dividend-paying securities, common stock, preferred stock, shares of investment

companies, convertible securities, warrants and rights.



The Fund may, but is not required to, use exchange-traded or over-the-counter

derivative instruments for risk management purposes or as part of the Fund's

investment strategies. The derivatives in which the Fund may invest include

futures on indices or currencies and foward currency agreements, which may be

used for risk management purposes to manage or adjust the risk profile of the

Fund. Futures on currencies and forward currency agreements may also be used to

hedge against a specific currency. In addition, futures on indices may be used

for investment (non-hedging) purposes to earn income; to enhance returns; to

replace more traditional direct investments; or to obtain exposure to certain

markets.



Management process



In selecting securities, the Advisor focuses on, among other things, identifying

discrepancies between a security's fundamental value and its market price. In

this context, the fundamental value of a given security is the Advisor's

assessment of what a security is worth. The Fund will select a security whose

fundamental value it estimates to be greater than its market value at any given

time. For each stock under analysis, the Advisor bases its estimates of value

upon economic, industry and company analysis, as well as upon a company's

management team, competitive advantage and core competencies. The Advisor then

compares its assessment of a security's value against the prevailing market

prices with the aim of constructing a focused portfolio of stocks with

attractive relative price/value characteristics. Although the Fund is a

diversified fund under the Investment Company Act of 1940, the Fund employs a

focused investment strategy that may result in the Fund investing in a lesser

number of issuers than other equity mutual funds.

Main risks

All investments carry a certain amount of risk and the Fund cannot guarantee

that it will achieve its investment objective. You may lose money by investing

in the Fund. An investment in the Fund is not a deposit of the bank and is not

insured or guaranteed by the Federal Deposit Insurance Corporation or any other

government agency. Below are some of the specific risks of investing in the

Fund.



Market risk: The market value of the Fund's investments may fluctuate, sometimes

rapidly or unpredictably, as the stock and bond markets fluctuate. Market risk

may affect a single issuer, industry, or sector of the economy, or it may affect

the market as a whole.



Management risk: The risk that the investment strategies, techniques and risk

analyses employed by the Advisor may not produce the desired results.



Foreign investing risk: The value of the Fund's investments in foreign

securities may fall due to adverse political, social and economic developments

abroad and due to decreases in foreign currency values relative to the US

dollar. Investments in foreign government bonds involve special risks because

the Fund may have limited legal recourse in the event of default. Also, foreign

securities are sometimes less liquid and more difficult to sell and to value

than securities of US issuers. These risks are greater for investments in

emerging market issuers. In addition, investments in emerging market is

suers may decline in value because of unfavorable foreign government actions,

greater risks of political instability or the absence of accurate information

about emerging market issuers.



Limited capitalization risk: The risk that securities of smaller capitalization

companies tend to be more volatile and less liquid than securities of larger

capitalization companies. This can have a disproportionate effect on the market

price of smaller capitalization companies and affect the Fund's ability to

purchase or sell these securities. In general, smaller capitalization companies

are more vulnerable than larger companies to adverse business or economic

developments and they may have more limited resources.



Limited number of issuers risk: The Fund may invest in a limited number of

issuers compared to other mutual funds and, consequently, may invest a greater

portion of its assets in one or more issuers than other mutual funds. The Fund,

therefore, may be more sensitive to a single economic, business, political,

regulatory or other occurrence, which may result in greater fluctuation in the

value of the Fund's shares and to a greater risk of loss.



Derivatives risk: The value of "derivatives"--so called because their value

"derives" from the value of an underlying asset, reference rate or index--may

rise or fall more rapidly than other investments. When using derivatives for

non-hedging purposes, it is possible for the Fund to lose more than the amount

it invested in the derivative. The risks of investing in derivative instruments

also include market and management risks. In addition, non-exchange traded

derivatives may be subject to liquidity risk, credit risk and mispricing or

valuation complexity. These derivatives risks are different from, and may be

greater than, the risks associated with investing directly in securities and

other instruments.



Leverage risk associated with financial instruments: The use of financial

instruments to increase potential returns, including derivatives used for

investment (non-hedging) purposes, may cause the Fund to be more volatile than

if it had not been leveraged. The use of leverage may also accelerate the

velocity of losses and can result in losses to the Fund that exceed the amount

originally invested.

Performance

Risk/return bar chart and table



The performance information that follows shows the Fund's performance

information in a bar chart and an average annual total returns table. The

information provides some indication of the risks of investing in the Fund by

showing changes in the Fund's performance from year to year and by showing how

the Fund's average annual total returns compare with those of a broad measure of

market performance. Index reflects no deduction for fees, expenses or taxes. The

Fund's past performance (before and after taxes) is not necessarily an

indication of how the Fund will perform in the future. On December 30, 2011, the

Fund's investment strategy, including its 80% policy, changed. The performance

information below, prior to that date, is attributable to the Fund's previous

investment strategy. Updated performance for the Fund is available at

http://globalam-us.ubs.com/corpweb/performance.do.



After-tax returns are calculated using the historical highest individual federal

marginal income tax rates and do not reflect the impact of state and local

taxes. Actual after-tax returns depend on an investor's tax situation and may

differ from those shown. In addition, the after-tax returns shown are not

relevant to investors who hold Fund shares through tax-deferred arrangements,

such as 401(k) plans or individual retirement accounts. After-tax returns for

other classes will vary from the Class Y shares' after-tax returns shown.

UBS U.S. Equity Opportunity Fund Annual Total Returns of Class Y Shares (2002 is the Fund’s first full year of operations)

Total return January 1 - September 30, 2011: (15.30)%

Best quarter during calendar years shown -- 2Q 2009: 19.76%

Worst quarter during calendar years shown -- 4Q 2008: (25.45)%

Average annual total returns (for the periods ended December 31, 2010)

Average Annual Total Returns UBS U.S. Equity Opportunity Fund	Average Annual Returns, Label		Average Annual Returns, 1 Year	Average Annual Returns, 5 Years	Average Annual Returns, Since Inception		Average Annual Returns, Inception Date
CLASS A	Class A Return before taxes		4.46%	(1.96%)	2.47%		Dec. 07, 2001
CLASS B	Class B Return before taxes		4.74%	(1.83%)	2.96%		Nov. 08, 2001
CLASS C	Class C Return before taxes	[1]	8.49%	(1.58%)	2.61%		Dec. 12, 2001
CLASS Y	Class Y Return before taxes		10.92%	(0.53%)	3.19%		Jun. 29, 2001
After Taxes on Distributions CLASS Y	Class Y Return after taxes on distributions		10.73%	(1.72%)	2.01%		Jun. 29, 2001
After Taxes on Distributions and Sales CLASS Y	Class Y Return after taxes on distributions and sale of fund shares		7.34%	(0.47%)	2.68%		Jun. 29, 2001
Russell 1000 Index	Russell 1000 Index	[2]	16.10%	2.59%		[3]
Russell 1000 Value Index	Russell 1000 Value Index		15.51%	1.28%		[3]

[1] Since the "Acquired fund fees and expenses" are not directly borne by the Fund, they are not reflected in the Fund's financial statements, and therefore the amounts listed in "Total annual fund operating expenses" and "Total annual fund operating expenses after management fee waiver/expense reimbursements" will differ from those presented in the Financial highlights.

[2] The Trust, with respect to the Fund, and UBS Global Asset Management (Americas) Inc., the Fund's investment advisor ("UBS Global AM (Americas)" or the "Advisor"), have entered into a written agreement pursuant to which the Advisor has agreed to waive a portion of its management fees and/or to reimburse expenses (excluding expenses incurred through investment in other investment companies, interest, taxes, brokerage commissions and extraordinary expenses) to the extent necessary so that the Fund's ordinary operating expenses (excluding expenses incurred through investment in other investment companies, interest, taxes, brokerage commissions and extraordinary expenses), through the period ending October 27, 2013, do not exceed 1.20% for Class A shares, 1.95% for Class B shares, 1.95% for Class C shares and 0.95% for Class Y shares. Pursuant to the written agreement, the Advisor is entitled to be reimbursed for any fees it waives and expenses it reimburses for a period of three years following such fee waivers and expense reimbursements to the extent that such reimbursement of the Advisor by the Fund will not cause the Fund to exceed any applicable expense limit that is in place for the Fund.

[1] Prior to September 30, 2003, Class C shares were subject to a maximum front-end sales charge of 1.00%; this front-end sales charge is not reflected in the average annual total returns presented for the Class C shares shown above.

[2] Effective December 30, 2011, the Fund's performance benchmark changed from the Russell 1000 Value Index to the Russell 1000 Index in connection with changes to the Fund's investment strategies effective on that date.

[3] Average annual total returns for the Russell 1000 Index for the life of each class were as follows: Class A--3.44%; Class B--3.86%; Class C--3.65%; Class Y--2.71%. Average annual total returns for the Russell 1000 Value Index for the life of each class were as follows: Class A--4.30%; Class B--4.65%; Class C--4.50%; Class Y--3.57%.

XML

Label	Element	Value
Risk Return [Abstract]	rr_RiskReturnAbstract
Document Type	dei_DocumentType	485BPOS
Document Period End Date	dei_DocumentPeriodEndDate	Jun. 30, 2011
Registrant Name	dei_EntityRegistrantName	UBS FUNDS
Central Index Key	dei_EntityCentralIndexKey	0000886244
Amendment Flag	dei_AmendmentFlag	false
Document Creation Date	dei_DocumentCreationDate	Dec. 29, 2011
Document Effective Date	dei_DocumentEffectiveDate	Dec. 30, 2011
UBS U.S. Equity Opportunity Fund (Prospectus Summary) | UBS U.S. Equity Opportunity Fund | CLASS A
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	BNVAX
UBS U.S. Equity Opportunity Fund (Prospectus Summary) | UBS U.S. Equity Opportunity Fund | CLASS B
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	BNVBX
UBS U.S. Equity Opportunity Fund (Prospectus Summary) | UBS U.S. Equity Opportunity Fund | CLASS C
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	BNVCX
UBS U.S. Equity Opportunity Fund (Prospectus Summary) | UBS U.S. Equity Opportunity Fund | CLASS Y
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	BUSVX