Why Not? is an album by American saxophonist Marion Brown. It was recorded in October 1966 in New York City, and was released in 1968 on the ESP-Disk label. The album, which was also released with the title Why Not, features Brown on alto saxophone, Stanley Cowell on piano, Sirone on bass, and Rashied Ali on drums. The album was recorded roughly a month prior to Brown's album Juba-Lee. The tracks were reissued on the 2020 ezz-thetics album Why Not? Porto Novo! Revisited.

Marion Brown was an American jazz alto saxophonist, composer, writer, visual artist, and ethnomusicologist. He was a member of the avant-garde jazz scene in New York City during the 1960s, playing alongside musicians such as John Coltrane, Archie Shepp, and John Tchicai. He performed on Coltrane's landmark 1965 album Ascension. AllMusic reviewer Scott Yanow described him as "one of the brightest and most lyrical voices of the 1960s avant-garde."