Two Not One is an instrumental jazz composition by Lennie Tristano, who is its sole credited writer. Its original recording features Lee Konitz on alto saxophone and Warne Marsh on tenor saxophone, both pupils of Tristano. It was made on 14 June 1955 at Coastal Studios in New York City, with Sal Mosca, Billy Bauer, Oscar Pettiford and Kenny Clarke, and issued as track 5 of the Atlantic album Lee Konitz with Warne Marsh (SD 1217) that same year.
The album is classed as cool jazz. Later recordings of the piece include versions by Konitz, Marsh, Anthony Braxton and Ernesto Jodos, among others.
