Exhibit 32.1

Certification Pursuant to 18 U.S.C. Sec. 1350

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In connection with the filing by Select Income REIT (the “Company”) of the Quarterly Report on Form 10-Q for the period ended March 31, 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.

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/s/ David M. Blackman	/s/ John C. Popeo
David M. Blackman	John C. Popeo
President and Chief Operating Officer	Chief Financial Officer and Treasurer
Date: May 1, 2018