Simon Williams may refer to:

  • Simon Williams (actor) (born 1946), English actor best known for playing James Bellamy in Upstairs, Downstairs
  • Simon Williams (shot putter) (born 1967), English shot put and discus athlete
  • Simon Williams (sociologist) (born 1961), professor of sociology at the University of Warwick
  • 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 (cricketer) (born 1970), former English cricketer
  • Simon Williams (Royal Navy officer) (born 1960), British Royal Navy officer
  • Simon Channing Williams (1945–2009), British film producer
  • Simon Williams (artist) (born 1973), Welsh comic artist
  • Simon Williams (weightlifter) (1919–2000), Jamaican Olympic weightlifter
  • Simon Williams, the real name of Marvel Comics superhero Wonder Man