Grant Williams may refer to:

• Grant Williams (actor) (1931–1985), American actor
• Grant Williams (American football) (born 1974), American football player
• Grant Williams (footballer) (born 1969), Australian football player
• Grant Williams (rugby union) (born 1996), South African rugby player
• Grant Williams (basketball) (born 1998), American basketball player
• Grant R. Williams (1930–1964), US Navy test pilot