Marc Charles "Mars" Williams (May 29, 1955 – November 20, 2023) was an American jazz and rock saxophonist. He was a member of the American new wave band the Waitresses from 1980 to 1983, and a member of the British post-punk band the Psychedelic Furs from 1983 to 1989 and again from 2005 until his death in 2023. Williams also was a founding member of the acid jazz group Liquid Soul, and a member of the free jazz-oriented NRG Ensemble.
