Jack DeJohnette (born August 9, 1942) is an American jazz drummer, pianist, and composer.

An important figure of the fusion era of jazz, DeJohnette is one of the most influential jazz drummers of the 20th century, given his extensive work as leader and sideman for musicians including Charles Lloyd, Freddie Hubbard, Keith Jarrett, Bill Evans, John Abercrombie, Alice Coltrane, Sonny Rollins, Miles Davis, Joe Henderson, Michael Brecker, Herbie Hancock and John Scofield. He was inducted into the Modern Drummer Hall of Fame in 2007.

DeJohnette was born in Chicago, Illinois. He began his musical career as a pianist, studying from age four and first playing professionally at age fourteen. He later switched focus to the drums. DeJohnette credit his uncle, Roy I. Wood Sr., a Chicago disc jockey and vice president of the National Network of Black Broadcasters, as his inspiration to play music.