Albireo Pharma (ALBO) 10-K 2017 FY Annual report

Exhibit 32.1

CERTIFICATIONS UNDER SECTION 906

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), each of the undersigned officers of Albireo Pharma, Inc., a Delaware corporation (the “Company”), does hereby certify, to such officer’s knowledge, that:

The Annual Report for the year ended December 31, 2017 (the “Form 10-K”) of the Company fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, and the information contained in the Form 10-K fairly presents, in all material respects, the financial condition and results of operations of the Company.

Dated: March 27, 2018	/s/ Ronald H.W. Cooper
	Ronald H.W. Cooper
	President and Chief Executive Officer (principal executive officer)

Dated: March 27, 2018	/s/ Thomas A. Shea
	Thomas A. Shea
	Chief Financial Officer and Treasurer (principal financial officer and principal accounting officer)