Gordon Mumma (born March 30, 1935, in Framingham, Massachusetts) is an American composer. He is known most for his work with electronics, many devices of which he builds himself, and for his performances on horn.

Mumma entered the University of Michigan in 1952 at age 17, after dropping out of high school. He dropped out of Michigan after a year, but the connections he made in Ann Arbor were the foundation of much of his musical career. His early work was in piano, and his musical development drew on traditional composers such as Bach and Haydn, as well as modern composers such as Bartók, Schoenberg, Webern, and Ives.