Great Western Bancorp (GWB) 10-K 2018 FY Annual report

Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report of Great Western Bancorp, Inc. (the “Company”) on Form 10-K for the period ended September 30, 2018 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Ken Karels, Chief Executive Officer and Chairperson of the Board of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to the best of my knowledge:

(1) The Report fully complies with the requirements of Section 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 Company.

		Great Western Bancorp, Inc.
Date: November 27, 2018	By:	/s/ Ken Karels
	Name:	Ken Karels
	Title:	Chief Executive Officer and Chairperson of the Board