Les Elgart (August 3, 1917, New Haven, Connecticut-July 29, 1995, Dallas, Texas) was an American swing jazz bandleader and trumpeter.

Lester E. (Les) Elgart began playing trumpet as a teenager, and by age 20 had landed professional gigs. In the 1940s he played in bands led by Raymond Scott, Charlie Spivak, and Harry James, and occasionally found himself in bands alongside brother Larry. Together they put together their own Les & Larry Elgart Ensemble in 1945, hiring Nelson Riddle, Ralph Flanagan, and Bill Finegan to do arrangements. The union was short-lived, however, due to the Musician's Union recording strike and the waning of swing jazz's popularity; they split in 1946.