Exhibit 32.1

CERTIFICATION PURSUANT TO 18 U.S.C. SEC. 1350

In connection with the filing by Five Star Senior Living Inc. (the “Company”) of the Quarterly Report on Form 10-Q for the quarter ended September 30, 2018 (the “Report”), each of the undersigned hereby certifies, to the best of his 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.

	/s/ Bruce J. Mackey Jr.
	Bruce J. Mackey Jr.
	President and Chief Executive Officer
	/s/ Richard A. Doyle
	Richard A. Doyle
	Executive Vice President, Chief Financial Officer and Treasurer
Date: November 14, 2018