Trevor Williams may refer to:
Sports Trevor Williams (baseball) (born 1992), American baseball player Trevor C. Williams (born 1965), Canadian basketball player and coach Trevor Williams (American football) (born 1993), American football player Trevor Williams (footballer) (fl. 1902–1907), English footballer Trevor Williams (rugby union), Welsh rugby union player
Music Trevor Williams (bassist) (born 1945), British bass guitarist Trevor Williams (violinist) (1929–2007), British violinist
Other Sir Trevor Williams, 1st Baronet (1623–1692), Welsh politician, landowner, military commander and rebel Trevor Williams (bishop) (born 1948), former Bishop of Limerick and Killaloe Trevor Williams (plant geneticist) (1938–2015), British plant geneticist Trevor Williams (designer) (1931–2008), British film and television production designer Trevor Illtyd Williams (1921–1996), British scientist and historian