Leonard C. Fons (October 30, 1903 – May 25, 1956) was an American lawyer and Republican politician.
He was a member of the Wisconsin State Senate from 1931 to 1935 representing southern Milwaukee County.
His father, Louis Fons, was also a member of the Senate, having represented the 8th District.
Fons went to Marquette University High School and Campion High School in Prairie du Chien, Wisconsin.
In 1940, he was a candidate for the United States House of Representatives from Wisconsin's 4th congressional district as a member of the Wisconsin Progressive Party, losing to Thaddeus Wasielewski.