Exhibit 31.3

Certification of Chief Executive Officer

I, David L. French, certify that:

1.I have reviewed this Amendment No. 1 to the Annual Report on Form 10-K of Rosehill Resources Inc. for the year ended December 31, 2018; and

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report.

/s/ David L. French
David L. French
President and Chief Executive Officer

Date: June 21, 2019