Exhibit 99.906CERT

Exh. (b)

Certification Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (subsections (a) and (b) of section 1350, chapter 63 of title 18, United States Code)

In connection with the attached Report of Harris Associates Investment Trust (the “Registrant”) on Form N-CSR to be filed with the Securities and Exchange Commission (the “Report”), each of the undersigned officers of the Registrant does hereby certify that, to the best of such officer's knowledge:

1. The Report fully complies with the requirements of 13(a) or 15(d) of the Securities Exchange Act of 1934; and

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

By:	/s/ Rana J. Wright
	Rana J. Wright
	Principal Executive Officer
Date:	May 25, 2021
By:	/s/ Zachary D. Weber
	Zachary D. Weber
	Principal Financial Officer, Principal Accounting Officer and Treasurer
Date:	May 25, 2021

A signed original of this written statement required by Section 906, or other document authenticating, acknowledging, or otherwise adopting the signature that appears in typed form within the electronic version of this written statement required by Section 906, has been provided to the Registrant and will be retained by the Registrant and furnished to the Securities and Exchange Commission or its staff upon request.

This certification is being furnished to the Commission solely pursuant to 18 U.S.C. Section 1350 and is not being filed as part of the Form N-CSR with the Commission.