William “Sonny” Criss (23 October 1927 – 19 November 1977) was an American jazz musician.

An alto saxophonist of prominence during the bebop era of jazz, he was one of many players influenced by Charlie Parker.

William Criss was born in Memphis, Tennessee, United States, and moved to Los Angeles at the age of 15. He then went on to play in various bands including Howard McGhee‘s, which also featured Charlie Parker.

Criss had developed his own, concise, bluesy tone by this point, and though his basic style did not vary much, his ability on the instrument continued to develop. Nevertheless, he continued to drift from band to band, and played on some records with Johnny Otis and Billy Eckstine.