Jack Leroy Mull (born September 29, 1943) is a former minor league baseball catcher, a major league coach, and minor league manager, and is currently a minor league coach.

Mull began his pro career with the Quincy Cubs in 1969 and played in the minors until 1973.

He managed the GCL Cubs in 1974, then returned to AAA as a player in 1975 and 1976.

In 1985, Mull was a coach for the San Francisco Giants.

This biographical article relating to an American baseball catcher born in the 1940s is a stub.