John Hartman (born March 18, 1950) is an American drummer who was a co-founder and original drummer of the Doobie Brothers. At the band's inception, Hartman was the sole drummer. However, in late 1971, the group added second drummer Michael Hossack, and the dual-drummers formation has persisted ever since. (Hossack was replaced in 1973 by Keith Knudsen.)

John Coltrane and Johnny Hartman is a 1963 studio album featuring John Coltrane and Johnny Hartman. It was inducted into the Grammy Hall of Fame in 2013.

John Hartmann (October 24, 1830 in Auleben – 1897 in Liverpool, England ) was a Prussian brass composer. He is notable for having served Prince George, Duke of Cambridge as bandmaster in the British 4th Regiment, 12th Lancers.