Michael G. Kirby (born April 2, 1952) is a former member of the Wisconsin State Assembly.
Kirby was born on April 2, 1952, in Milwaukee, Wisconsin. After graduating from Wauwatosa West High School in Wauwatosa, Wisconsin, Kirby attended the University of Wisconsin-Oshkosh.
Kirby was elected to the Assembly in 1974. He is a Democrat.