QuickLinks -- Click here to rapidly navigate through this document

EXHIBIT 32.2

CORPORATE OFFICE PROPERTIES TRUST

CERTIFICATIONS REQUIRED BY
RULE 13a-14(b) UNDER THE SECURITIES EXCHANGE ACT OF 1934

        In connection with the Annual Report on Form 10-K of Corporate Office Properties Trust (the "Company") for the year ended December 31, 2010, as filed with the Securities and Exchange Commission on the date hereof (the "Report"), I, Stephen E. Riffee, Chief Financial Officer of the Company, certify that to my 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 result of operations of the Company.

/s/ STEPHEN E. RIFFEE Stephen E. Riffee
Chief Financial Officer

Date: February 11, 2011

QuickLinks

EXHIBIT 32.2

CORPORATE OFFICE PROPERTIES TRUST CERTIFICATIONS REQUIRED BY RULE 13a-14(b) UNDER THE SECURITIES EXCHANGE ACT OF 1934