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

Known for 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, Pat Metheny, Herbie Hancock and John Scofield, DeJohnette was inducted into the Modern Drummer Hall of Fame in 2007. He has won two Grammy Awards and been nominated for five others.

DeJohnette was born in Chicago, Illinois, to Jack DeJohnette (1911–2011) and Eva Jeanette DeJohnette (née Wood, 1918–1984). Although of predominantly African-American heritage, he has stated that he has some Native American ancestry, specifically Seminole and Crow. He began his musical career as a pianist, studying from age four with Antoinette Rich, the leader of an all-female symphony orchestra in Chicago, and first playing professionally at the age of 14. He later switched focus to the drums. When Jack was 13, he switched to drums and was taught drumming techniques from a local jazz drummer, Bobby Miller Jr, who lived in the same neighborhood. DeJohnette credits his uncle, Roy Wood, Sr. (1915–1995), a Chicago disc jockey and vice president/co-founder of the National Black Network of Black Broadcasters, as his inspiration to play music