STRADLEY, RONON, STEVENS & YOUNG, LLP

2600 One Commerce Square

Philadelphia, PA  19103

(215) 564-8000

1933 Act Rule 497(j)

                                                                                                                                          1933 Act File No. 002-73948

1940 Act File No. 811-03258

Direct Dial: (215) 564-8048

August 9, 2011

FILED VIA EDGAR

U.S. Securities and Exchange Commission

100 F Street, N.E.

Washington, D.C.  20549

Re:           DFA Investment Dimensions Group Inc. (the “Registrant”)

File Nos. 002-73948 and 811-03258

Rule 497(j) Filing                                                                                                                                                                                            

Ladies and Gentlemen:

Pursuant to Rule 497(j) under the Securities Act of 1933, as amended, this letter serves as certification that the form of Prospectuses and Statements of Additional Information that would have been filed under paragraph (c) of Rule 497 would not have differed from those contained in Post-Effective Amendment Nos. 130/131 to the Registration Statement of the Registrant, which was filed with the Securities and Exchange Commission electronically on July 25, 2011.

Please direct any questions or comments relating to this certification to me or, in my absence, to Mark A. Sheehan, Esquire at (215) 564-8027.

Very truly yours,

/s/ Jana L. Cresswell                                                        

Jana L. Cresswell