Leon Harry Gavin (February 25, 1893 – September 15, 1963) was a Republican member of the U.S. House of Representatives from Pennsylvania. Leon H. Gavin was born in Buffalo, New York, and moved to Oil City, Pennsylvania, in 1915. During the First World War he served in the United States Army as a sergeant in the Fifty-first Infantry Regiment of the 6th Infantry Division. He served on the Defense Council of Venango County, Pennsylvania. He was a member of the State Board of Appeals of the Selective Service System, the executive secretary of the Oil City Chamber of Commerce, and a member of the National Migratory Bird Conservation Commission from 1958 to 1963.