Alton Purnell (April 16, 1911 – January 14, 1987) was an American jazz pianist. He was a longtime performer in Dixieland jazz. Purnell was born in New Orleans on April 16, 1911. His brother, Theodore, became a reed player.

Purnell sang before playing piano professionally, beginning to do so locally in New Orleans in 1928. He played in the 1930s with Isaiah Morgan, Alphonse Picou, Big Eye Louis Nelson, Sidney Desvigne, and Cousin Joe, and with Bunk Johnson in the middle of the 1940s. Purnell joined George Lewis‘s band after Johnson’s broke up in 1946, and remained there well into the 1950s, including for international tours.