UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of the
Securities Exchange Act of 1934 (Amendment No.  )

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Five Star Senior Living Inc.

(Name of Registrant as Specified In Its Charter)
(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

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Important Notice Regarding the Availability of Proxy Materials for the Stockholder Meeting to Be Held on June 9, 2020. FIVE STAR SENIOR LIVING INC. * As part of our precautions regarding the coronavirus or COVID-19, we are planning for the possibility that the annual meeting may be held virtually solely by means of remote communication or via a live webcast. If we take this step, we will announce the decision to do so in advance, and we will provide details on how to participate in a press release and on our website at www.fivestarseniorliving.com. Please retain a copy of the control number from the Proxy Card, in the event that the meeting is held by remote communication or live webcast. You are receiving this communication because you hold shares in the company named above as of the record date noted above. This is not a ballot. You cannot use this notice to vote these shares. This communication presents only an overview of the more complete proxy materials that are available to you on the internet or by mail. We encourage you to access and review all of the important information contained in the proxy materials before voting. FIVE STAR SENIOR LIVING INC. C/O BROADRIDGE FINANCIAL SOLUTIONS, INC. P.O. BOX 1342 BRENTWOOD, NY 11717 proxy materials and voting instructions. D04996-P36522 See the reverse side of this notice to obtain NOTICE OF ANNUAL MEETING OF STOCKHOLDERS Meeting Information Meeting Type:Annual For holders as of:March 16, 2020 Date: June 9, 2020Time: 9:30 a.m., Eastern Time Location: Five Star Senior Living Inc. Two Newton Place 255 Washington Street, Suite 100 Newton, Massachusetts 02458*

Before You Vote How to Access the Proxy Materials Have the information that is printed in the box marked by the arrow XXXX XXXX XXXX XXXX (located on the by the arrow XXXX XXXX XXXX XXXX (located on the following page) in the subject line. How To Vote Please Choose One of the Following Voting Methods www.proxyvote.com. Have the information that is printed in the box marked by the arrow XXXX XXXX XXXX XXXX D04997-P36522 Vote in Person: Stockholders of record of the company as of March 16, 2020, or their duly authorized proxies, are entitled to vote in person at the meeting. At the meeting, you will need to request a ballot to vote these shares. To obtain directions to the location of the 2020 Annual Meeting of Stockholders, please call 617-796-8245. Authorize Your Proxy by Internet: To authorize a proxy to submit your vote now by internet, go to (located on the following page) available and follow the instructions. Authorize Your Proxy by Telephone or by Mail: You can authorize a proxy to submit your vote by telephone or by mail by requesting a paper copy of the materials, which will include a proxy card with instructions. The Notice of Annual Meeting, Proxy Statement and Annual Report are available at www.proxyvote.com. How to View Online: following page) and visit: www.proxyvote .com. If you want to receive a paper or email copy of these documents, you must request one. There is no charge to you for requesting a copy. Please make your request for a copy as instructed below on or before May 26, 2020, to facilitate timely delivery. How to Request and Receive a PAPER or EMAIL Copy for the 2020 Annual Meeting of Stockholders and for Stockholder Meetings in the Future: 1) BY INTERNET:www.proxyvote.com 2) BY TELEPHONE: 1-800-579-1639 3) BY EMAIL*:sendmaterial@proxyvote.com * If requesting materials by email, please send a blank email with the information that is printed in the box marked Requests, instructions and other inquiries sent to this email address will NOT be forwarded to your investment advisor.

The Board of Directors Recommends a Vote FOR both Nominees for Director in Proposal 1 and FOR Proposals 2, 3 and 4. 1. Election of Directors. Nominee (for Independent Director in Group I): Barbara D. Gilmore Nominee (for Managing Director in Group I): Adam D. Portnoy 2. Approval of the Company's Amended and Restated 2014 Equity Compensation Plan. 3. Advisory vote to approve executive compensation. 4. Ratification of the appointment of RSM US LLP as independent auditors to serve for the 2020 fiscal year. D04998-P36522 Voting Items

D04999-P36522