Weldon Leo “Jack” Teagarden (August 20, 1905 – January 15, 1964) was an American jazz trombonist and singer. According to critic Scott Yannow of Allmusic, Teagarden was the preeminent American jazz trombone player before the bebop era of the 1940s and “one of the best jazz singers too”. Teagarden’s early career was as a sideman with the likes of Paul Whiteman and lifelong friend Louis Armstrong.

Born in Vernon, Texas, United States, his brothers Charlie and Clois “Cub” and his sister Norma also became professional musicians. His father was an amateur brass band trumpeter and started him on baritone horn; by age seven he had switched to trombone. His first public performances were in movie theaters, where he accompanied his mother, a pianist.