Moses Gage Leonard (July 10, 1809 – March 20, 1899) was an American politician who served one term as a U.S. Representative from New York from 1843 to 1845.

Born in Stafford, Connecticut, Leonard grew up in Union and attended the public schools.

He served as a member of the city council of San Francisco in 1850.

He was interred in Oak Hill Cemetery, Nyack, New York.

This article incorporates public domain material from the Biographical Directory of the United States Congress