Donny McCaslin (born August 11, 1966) is an American jazz saxophonist.

McCaslin's father was a vibraphonist, and he played in his father's ensemble at the age of twelve. He had his own group in Aptos High School which played three years at the Monterey Jazz Festival. He studied under Paul Contos and Brad Hecht in the San Francisco region, both of whom played in his father's group. He played in a number of youth ensembles, most notably under the legendary band director and music educator Don Keller and toured Europe and Japan with them; he was offered a full scholarship to the Berklee College of Music, where he enrolled in 1984. While there he was influenced by Gary Burton, Herb Pomeroy, Billy Pierce, George Garzone, and Joe Viola. McCaslin performed regularly in Boston and Cambridge with The True Colors Big Band, run by composer Ken Schaphorst. In 1987 he joined Burton's group and toured the world with him for four years.