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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Office Properties Income Trust

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Your Vote Counts! OFFICE PROPERTIES INCOME TRUST 2021 Annual Meeting Vote by June 16, 2021 11:59 PM ET OFFICE PROPERTIES INCOME TRUST C/O BROADRIDGE FINANCIAL SOLUTIONS, INC. P.O. BOX 1342 BRENTWOOD, NY 11717 D50250-P54115 You invested in OFFICE PROPERTIES INCOME TRUST and it’s time to vote! You have the right to vote on proposals being presented at the Annual Meeting. This is an important notice regarding the availability of proxy material for the shareholder meeting to be held on June 17, 2021. Get informed before you vote View the Notice of Annual Meeting, Proxy Statement and Annual Report online OR you can receive a free paper or email copy of the material(s) by requesting prior to June 3, 2021. If you would like to request a copy of the material(s) for this and/or future shareholder meetings, you may (1) visit www.ProxyVote.com, (2) call 1-800-579-1639 or (3) send an email to sendmaterial@proxyvote.com. If sending an email, please include your control number (indicated below) in the subject line. Unless requested, you will not otherwise receive a paper or email copy. Smartphone users Point your camera here and vote without entering a control number Vote Virtually at the Meeting* June 17, 2021 9:30 a.m., Eastern time Virtually at: https://www.viewproxy.com/OfficePropertiesIncomeTrust/2021/ *Please check the meeting materials for any special requirements for meeting attendance. V1 For complete information and to vote, visit www.ProxyVote.com Control #

Vote at www.ProxyVote.com THIS IS NOT A VOTABLE BALLOT This is an overview of the proposals being presented at the upcoming shareholder meeting. Please follow the instructions on the reverse side to vote these important matters. Board Recommends Voting Items D50251-P54115 Prefer to receive an email instead? While voting on www.ProxyVote.com, be sure to click “Sign up for E-delivery”. 1. Election of Trustees. Nominee (for Independent Trustee): William A. Lamkin For Nominee (for Independent Trustee): Elena B. Poptodorova For 2. Advisory vote to approve executive compensation. For 3. Ratification of the appointment of Deloitte & Touche LLP as independent auditors to serve for the 2021 fiscal year. For