Form 485BPOS VANGUARD INDEX FUNDS
| SECURITIES AND EXCHANGE COMMISSION | |
| Washington, D.C. 20549 | |
| Form N-1A | |
| REGISTRATION STATEMENT (NO. 2-56846) | |
| UNDER THE SECURITIES ACT OF 1933 | [X] |
| Pre-Effective Amendment No. | [ ] |
| Post-Effective Amendment No. 169 | [X] |
| and | |
| REGISTRATION STATEMENT (NO. 811-02652) UNDER THE INVESTMENT COMPANY ACT | |
| OF 1940 | |
| Amendment No. 170 | [X] |
| VANGUARD INDEX FUNDS |
| (Exact Name of Registrant as Specified in Declaration of Trust) |
| P.O. Box 2600, Valley Forge, PA 19482 |
| (Address of Principal Executive Office) |
| Registrants Telephone Number (610) 669-1000 |
| Anne E. Robinson, Esquire |
| P.O. Box 876 |
| Valley Forge, PA 19482 |
| Approximate Date of Proposed Public Offering: |
| It is proposed that this filing will become effective (check appropriate box) |
| [X] immediately upon filing pursuant to paragraph (b) |
| [ ] on (date) pursuant to paragraph (b) |
| [ ] 60 days after filing pursuant to paragraph (a)(1) |
| [ ] on (date) pursuant to paragraph (a)(1) |
| [ ] 75 days after filing pursuant to paragraph (a)(2) |
| [ ] on (date) pursuant to paragraph (a)(2) of rule 485 |
| If appropriate, check the following box: |
| [ ] This 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, the Registrant hereby certifies that it meets all requirements for effectiveness of this Registration Statement pursuant to Rule 485(b) under the Securities Act of 1933 and has duly caused this Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the Town of Valley Forge and the Commonwealth of Pennsylvania, on the 16th day of May, 2019.
| VANGUARD INDEX FUNDS |
| BY:___________/s/ Mortimer J. Buckley* |
| Mortimer J. Buckley |
| Chief Executive Officer, President, and Trustee |
Pursuant to the requirements of the Securities Act of 1933, this Post-Effective Amendment to the Registration Statement has been signed below by the following persons in the capacities and on the date indicated:
| Signature | Title | Date |
| /S/ MORTIMER J. BUCKLEY* | Chairman and Chief Executive | May 16, 2019 |
| Officer | ||
| Mortimer J. Buckley | ||
| /S/ EMERSON U. FULLWOOD* | Trustee | May 16, 2019 |
| Emerson U. Fullwood | ||
| /S/ AMY GUTMANN* | Trustee | May 16, 2019 |
| Amy Gutmann | ||
| /S/ F. JOSEPH LOUGHREY* | Trustee | May 16, 2019 |
| F. Joseph Loughrey | ||
| /s/ MARK LOUGHRIDGE* | Trustee | May 16, 2019 |
| Mark Loughridge | ||
| /s/ SCOTT C. MALPASS* | Trustee | May 16, 2019 |
| Scott C. Malpass | ||
| /S/ DEANNA MULLIGAN* | Trustee | May 16, 2019 |
| Deanna Mulligan | ||
| /S/ ANDRÉ F. PEROLD* | Trustee | May 16, 2019 |
| André F. Perold | ||
| /S/ SARAH BLOOM RASKIN* | Trustee | May 16, 2019 |
| Sarah Bloom Raskin | ||
| /S/ PETER F. VOLANAKIS* | Trustee | May 16, 2019 |
| Peter F. Volanakis | ||
| /S/ THOMAS J. HIGGINS* | Chief Financial Officer | May 16, 2019 |
| Thomas J. Higgins | ||
*By: /s/ Anne E. Robinson
Anne E. Robinson, pursuant to a Power of Attorney filed on January 18, 2018, see file Number 33-32216, Incorporated by Reference.
| INDEX TO EXHIBITS | |
| XBRL Instance Document | Ex-101.INS |
| XBRL Taxonomy Extension Schema Document | Ex-101.SCH |
| XBRL Taxonomy Extension Calculation Linkbase Document | Ex-101.CAL |
| XBRL Taxonomy Extension Definition Linkbase Document. | Ex-101.DEF |
| XBRL Taxonomy Extension Labels Linkbase Document | Ex-101.LAB |
| XBRL Taxonomy Extension Presentation Linkbase Document | Ex-101.PRE |
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