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File No 33-41078

811-6325

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM N‑1A

REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 [X]

Pre-Effective Amendment No. [__]

Post-Effective Amendment No. 27 [X]

and/or

REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940 [X]

Amendment No. 27 [X]

(Check appropriate box or boxes.)

Dreyfus Midcap Index Fund, Inc.

(Exact Name of Registrant as Specified in Charter)

c/o The Dreyfus Corporation

200 Park Avenue, New York, New York 10166

(Address of Principal Executive Offices) (Zip Code)

Registrant's Telephone Number, including Area Code: (212) 922-6000

Michael A. Rosenberg, Esq.

200 Park Avenue

New York, New York 10166

(Name and Address of Agent for Service)

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

X immediately upon filing pursuant to paragraph (b)

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on __(date)____ pursuant to paragraph (b)

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

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on (date) pursuant to paragraph (a)(1)

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

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on (date) pursuant to paragraph (a)(2) of Rule 485

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If appropriate, check the following box:

this post-effective amendment designates a new effective date for a previously filed post-effective

amendment.

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SIGNATURES

_____________

Pursuant to the requirements of the Securities Act of 1933 and the Investment Company Act of 1940, the Registrant certifies that it meets all of the requirements for effectiveness of this Amendment to the Registration Statement pursuant to Rule 485(b) under the Securities Act of 1933 and has duly caused this Amendment to the Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of New York, and State of New York on the 18th day of March 2011.

DREYFUS MIDCAP INDEX FUND, INC.

BY: /s/ Bradley J. Skapyak*

_____________________________

Bradley J. Skapyak, PRESIDENT

Pursuant to the requirements of the Securities Act of 1933, this Amendment to the Registration Statement has been signed below by the following persons in the capacities and on the date indicated.

Signatures Title Date

/s/ Bradley J. Skapyak* President (Principal Executive 03/18/11

________________________________ Officer)

Bradley J. Skapyak

/s/ James Windels* Treasurer 03/18/11

________________________________ (Principal Financial and

James Windels Accounting Officer)

/s/ Joseph S. DiMartino* Chairman of the Board 03/18/11

________________________________

Joseph S. DiMartino

/s/ Peggy C. Davis* Board Member 03/18/11

________________________________

Peggy C. Davis

/s/ David P. Feldman* Board Member 03/18/11

________________________________

David P. Feldman

/s/ Ehud Houminer* Board Member 03/18/11

________________________________

Ehud Houminer

/s/ Martin Peretz * Board Member 03/18/11

________________________________

Martin Peretz

*BY:

/s/ Michael A. Rosenberg

Michael A. Rosenberg

Attorney-in-Fact

INDEX OF EXHIBITS

Exhibits

EX-101.INS – Instance Document.

EX-101.SCH – Taxonomy.

EX-101.CAL – Calculation Linkbase.

EX-101.DEF – Definition Linkbase.

EX-101.LAB – Labels Linkbase.

EX-101.PRE – Presentation Linkbase.