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. 167 | [X] |
| and | |
| REGISTRATION STATEMENT (NO. 811-02652) UNDER THE INVESTMENT COMPANY ACT | |
| OF 1940 | |
| Amendment No. 168 | [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, 2018. | ||
| 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/ F. WILLIAM MCNABB III* | Chairman of the Board of | May 16, 2018 |
| F. William McNabb III | Trustees | |
| /S/ MORTIMER J. BUCKLEY* | Chief Executive Officer, | May 16, 2018 |
| Mortimer J. Buckley | President, and Trustee | |
| /S/ EMERSON U. FULLWOOD* | Trustee | May 16, 2018 |
| Emerson U. Fullwood | ||
| /S/ AMY GUTMANN* | Trustee | May 16, 2018 |
| Amy Gutmann | ||
| /S/ JOANN HEFFERNAN HEISEN* | Trustee | May 16, 2018 |
| JoAnn Heffernan Heisen | ||
| /S/ F. JOSEPH LOUGHREY* | Trustee | May 16, 2018 |
| F. Joseph Loughrey | ||
| /s/ MARK LOUGHRIDGE* | Trustee | May 16, 2018 |
| Mark Loughridge | ||
| /s/ SCOTT C. MALPASS* | Trustee | May 16, 2018 |
| Scott C. Malpass | ||
| /S/ DEANNA MULLIGAN* | Trustee | May 16, 2018 |
| Deanna Mulligan | ||
| /S/ ANDRÉ F. PEROLD* | Trustee | May 16, 2018 |
| André F. Perold | ||
| /S/ SARAH BLOOM RASKIN* | Trustee | May 16, 2018 |
| Sarah Bloom Raskin | ||
| /S/ PETER F. VOLANAKIS* | Trustee | May 16, 2018 |
| Peter F. Volanakis | ||
| /S/ THOMAS J. HIGGINS* | Chief Financial Officer | May 16, 2018 |
| 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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