Simon Williams may refer to:
Simon Williams (actor) (born 1946), English actor best known for playing James Bellamy in Upstairs, Downstairs
Simon Williams (athlete) (born 1967), English shot put and discus athlete
Simon Williams (sociologist) (born 1961), professor of sociology at the University of Warwick
Simon Williams (radio presenter) (born 1969), 102.4 Wish FM, Tower FM CFM, Key 103, West Hull FM
Simon Williams (bassist) (born 1973), bassist and backup singer to ska-punk band Goldfinger
Simon Williams (chess player) (born 1979), English chess player, grandmaster
Simon Williams (musician) (born 1970), British musician, graphic designer and blogger
Simon Williams (cricketer) (born 1970), former English cricketer
Simon Williams (rugby league) (born 1989), rugby league player
Simon Williams, the real name of Marvel Comics superhero Wonder Man