John Maurice Hartman (July 3, 1923 – September 15, 1983) was an American jazz singer who specialized in ballads and earned critical acclaim, though he was never widely known. He sang and recorded with Earl Hines' and Dizzy Gillespie's big bands and with Erroll Garner during their heydays. He's best remembered for his collaboration in 1963 with saxophonist John Coltrane, John Coltrane and Johnny Hartman, a landmark album for both him and Coltrane.