| March 3, 2006 |
| Securities and Exchange Commission |
| Judiciary Plaza |
| 450 Fifth Street, NW |
| Washington, DC 20549 |
| Attention: Filings – Rule 497(j) |
| Re: Dreyfus Index Funds, Inc. |
| Post-Effective Amendment No. 22 to Registration Statement on Form N1- |
| REGISTRATION NOS: 811-5883 |
| Dear Sir or Madam: |
| Pursuant to Rule 497(j) under the Securities Act of 1933, this is to certify that the form of |
| Prospectus and Statement of Additional Information that would have been filed under |
| paragraph (b) or (c) of this section does not differ from that contained in the most recent |
| amendment, Post-Effective Amendment No. 22 to the Registration Statement, |
| electronically filed with the Securities and Exchange Commission on February 23, 2006. |
| Very truly yours, |
| /s/ Matthew J. Tronzano |
| Matthew J. Tronzano |
| Paralegal |