Leon Charles Weiss (1882–1953) was an architect in the 20th century who designed various public buildings in Louisiana and Mississippi, especially during the 1930s. Many of Weiss's notable designs were commissioned by populist politician Huey Long and financed by the Public Works Administration. Although he designed in various architectural styles, many of his projects are considered to be PWA Moderne. Weiss's architectural career was interrupted for several years with a 1940 criminal conviction of fraud.