Fonzi Thornton is an American singer, song writer/producer, stage performer and radio personality.

Thornton has provided background vocals on albums by artists which include Aretha Franklin, Luther Vandross, Diana Ross, Garth Brooks, Chic, Ray Charles, Bruce Springsteen, Sheena Easton, Mariah Carey, David Bowie, Michael Jackson, Robert Palmer, Air Supply, Natalie Cole, The B-52's, R. Kelly, Leona Lewis, Shawn Colvin, Scritti Politti, Al Jarreau, Celine Dion, Roxy Music, Bryan Ferry, Patti Labelle, Jewel, Bette Midler, Bob James, Candi Staton, Donald Fagen, Carly Simon, Change, Michael Bolton, Jody Watley, Debbie Harry, BB and Q band, Joe Cocker, Jimmie Vaughan, The System, Vanessa Williams, and Will Downing.