Leon René (February 6, 1902 - May 30, 1982) was an American music composer of pop, R&B and rock and roll songs and a record producer in the 1930s, 1940s, and 1950s. He sometimes used the songwriting pseudonym Jimmy Thomas or Jimmie Thomas. He also established several record labels.
Born in Covington, Louisiana, he is best known for his hit song "When the Swallows Come Back to Capistrano". The song, written as a tribute to the annual springtime return of the cliff swallows to Mission San Juan Capistrano in Southern California, spent several weeks at the top of Your Hit Parade charts during its initial release in 1940. The lyrics say: