Michael John Cosgrove (born February 17, 1951) is a former Major League Baseball pitcher with the Houston Astros from 1972 to 1976.

Cosgrove graduated high school in 1969 from Bourgade Catholic High School in Phoenix, Arizona and was the 16th round pick (374th overall) of the Cincinnati Reds of the 1969 June Baseball draft.

He was then drafted in the January 1970 secondary Baseball draft in the 2nd round (38th overall) by the Houston Astros and assigned to play for the Cocoa Astros of the Florida State League.

Called up in 1972, Cosgrove was used primarily as a left-handed relief pitcher.

This biographical article relating to an American baseball pitcher born in the 1950s is a stub.