CERTIFICATIONS PURSUANT TO SECTION 906 OF THE

SARBANES-OXLEY ACT OF 2002

David P. Butler and Gerard K. O’Reilly, Co-Principal Executive Officers, and Lisa M. Dallmer, Principal Financial Officer, of Dimensional Investment Group Inc., a Maryland corporation (the “Registrant”), each certify that:

1. The Registrant’s periodic report on Form N-CSR for the period ended April 30, 2020 (the “Report”) fully complies with the requirements of Section 13(a) or Section 15(d) of the Securities Exchange Act of 1934, as amended, as applicable; and

2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Registrant.

By:	/s/ David P. Butler
	David P. Butler
	Co-Principal Executive Officer
	Dimensional Investment Group Inc.

Date: July 6, 2020

By:	/s/ Gerard K. O’Reilly
	Gerard K. O’Reilly
	Co-Principal Executive Officer
	Dimensional Investment Group Inc.

Date: July 6, 2020

By:	/s/ Lisa M. Dallmer
	Lisa M. Dallmer
	Principal Financial Officer
	Dimensional Investment Group Inc.

Date: July 6, 2020