Aaron Joseph Colnon (August 5, 1870 – December 8, 1936) was an American football player and coach.

He was the fifth head football coach at Colgate University, serving for one season, in 1896, and compiling a record of 3–4–1.

Colnon played on the Cornell football team from 1889 to 1893.

After graduating, he later played with the Duquesne and Crescent Athletic Clubs in New York.

This biographical article relating to a college football coach first appointed in the 1890s is a stub.