Dreyfus Stock Index Fund, Inc. (Prospectus Summary) | Dreyfus Stock Index Fund, Inc.

Fund Summary

Investment Objective

The fund seeks to match the total return of the Standard & Poor's® 500 Composite
Stock Price Index (S&P 500® Index).

Fees and Expenses

This table describes the fees and expenses that you may pay if you buy and hold
shares of the fund. These figures do not reflect any fees or charges imposed by
participating insurance companies under their Variable Annuity contracts (VA
contracts) or Variable Life Insurance policies (VLI policies).

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses Dreyfus Stock Index Fund, Inc.	Initial Shares	Service Shares
Management fees	0.25%	0.25%
Distribution and/or service (Rule 12b-1) fees	none	0.25%
Other expenses (including shareholder services fees)	0.02%	0.02%
Total annual fund operating expenses	0.27%	0.52%

Example

The Example below 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. The Example also
assumes that your investment has a 5% return each year and that the fund's
operating expenses remain the same. The Example does not reflect fees and
expenses incurred under VA contracts and VLI policies; if they were reflected,
the figures in the Example would be higher. Although your actual costs may be
higher or lower, based on these assumptions your costs would be:

Expense Example Dreyfus Stock Index Fund, Inc. (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
Initial Shares	28	87	152	343
Service Shares	53	167	291	653

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 may
indicate higher transaction costs. 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 3.27%
of the average value of its portfolio.

Principal Investment Strategy

To pursue its goal, the fund generally is fully invested in stocks included in
the S&P 500® Index and in futures whose performance is tied to the index. The
fund generally invests in all 500 stocks in the S&P 500 Index in proportion to
their weighting in the index. The S&P 500 Index is an unmanaged index of 500
common stocks chosen to reflect the industries of the U.S. economy and is often
considered a proxy for the stock market in general. S&P weights each company's
stock in the index by its market capitalization, adjusted by the number of
available float shares divided by the company's total shares outstanding, which
means larger companies with more available float shares have greater
representation in the index than smaller ones. The fund attempts to have a
correlation between its performance and that of the S&P 500 Index of at least
.95 before fees and expenses. A correlation of 1.00 would mean that the fund and
the index were perfectly correlated.

"Standard & Poor's®," "S&P®," "Standard & Poor's® 500," and "S&P 500®" are
trademarks of Standard & Poor's Financial Services LLC and have been licensed
for use by the fund. The fund is not sponsored, endorsed, sold or promoted by
Standard & Poor's and Standard and Poor's makes no representation regarding the
advisability of investing in the fund.

Principal Risks

An investment in the fund is not a bank deposit. It is not insured or guaranteed
by the FDIC or any other government agency. It is not a complete investment
program. The fund's share price fluctuates, sometimes dramatically, which means
you could lose money.

o Risks of stock investing. Stocks generally fluctuate more in value than bonds
and may decline significantly over short time periods. There is the chance that
stock prices overall will decline because stock markets tend to move in cycles,
with periods of rising prices and falling prices. The market value of a stock
may decline due to general weakness in the stock market or because of factors
that affect the company or its particular industry.

o Indexing strategy risk. The fund uses an indexing strategy. It does not
attempt to manage market volatility, use defensive strategies or reduce the
effects of any long-term periods of poor index performance. The correlation
between fund and index performance may be affected by the fund's expenses,
changes in securities markets, changes in the composition of the index and the
timing of purchases and redemptions of fund shares.

o Non-diversification risk. The fund is non-diversified, which means that the
fund may invest a relatively high percentage of its assets in a limited number
of issuers. Therefore, the fund's performance may be more vulnerable to changes
in the market value of a single issuer or group of issuers and more susceptible
to risks associated with a single economic, political or regulatory occurrence
than a diversified fund.

Performance

The following bar chart and table provide some indication of the risks of
investing in the fund. The table compares the average annual total returns
of the fund's shares to those of a broad measure of market performance.
The fund's past performance is no guarantee of future results. More
recent performance information may be available at www.dreyfus.com.

Performance information reflects the fund's expenses only and does not reflect
the fees and charges imposed by participating insurance companies under their VA
contracts or VLI policies. Because these fees and charges will reduce total
return, policyowners should consider them when evaluating and comparing the
fund's performance. Policyowners should consult the prospectus for their
contract or policy for more information.

The bar chart shows changes in the performance of the fund's Initial shares
from year to year.

Year-by-Year Total Returns as of 12/31 each year (%) -- Initial Shares

Best Quarter              
Q2, 2009: 15.87%          
Worst Quarter             
Q4, 2008: -22.00%

The table compares the average annual total returns of the fund's shares
to those of a broad measure of market performance.

Average Annual Total Returns (as of 12/31/11)

Average Annual Total Returns Dreyfus Stock Index Fund, Inc.	Average Annual Returns, Label	Average Annual Returns, 1 Year	Average Annual Returns, 5 Years	Average Annual Returns, 10 Years
Initial Shares	Initial Shares	1.88%	(0.45%)	2.69%
Service Shares	Service Shares	1.62%	(0.70%)	2.43%
S&P 500 Index	S&P 500 Index reflects no deduction for fees, expenses or taxes	2.09%	(0.25%)	2.92%