Gary Wayne Serum (born October 24, 1956) is a retired Major League Baseball pitcher.

He played 2+1⁄2 seasons at the major league level for the Minnesota Twins.

He was signed by the Twins as an amateur free agent in 1975.

Serum played his last professional season with the New York Yankees' Double-A Nashville Sounds and Triple-A Columbus Clippers in 1982.

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