Albert W. "Happy" Caldwell (sometimes incorrectly spelled Cauldwell) (July 25, 1903 in Chicago – December 29, 1978 in New York City) was an American jazz clarinetist and tenor saxophonist.
Caldwell began on clarinet at age 16, playing in the Eighth Illinois Regimental Band and soon after in an Army band. He studied to be a pharmacist but eventually gave up his medicinal studies for jazz.
