Michael Joseph Morrissey (May 5, 1876 – February 22, 1939), known as Frank and nicknamed "Deacon," was a pitcher in Major League Baseball in the early twentieth century.

Morrissey appeared in a total of six games as a pitcher in 1901 and 1902, five of which were as a member of the Chicago Orphans.

He compiled a 1–3 record with fourteen strikeouts in his six appearances.

The Orphans also used him as a third baseman in two games in 1902.

This biographical article relating to an American baseball pitcher born in the 1870s is a stub.