John Williams (born 5 January 1985) is an Australian former professional rugby league player who played in the 2000s.

He played as a wing in the National Rugby League for the Parramatta Eels, Sydney Roosters, North Queensland Cowboys and Cronulla-Sutherland Sharks.

At the end of 2006, Williams was released by Parramatta and he signed a one-year deal to join the Sydney Roosters.

Over his three years at North Queensland, Williams played a total of 54 games, making it easily the most successful stage of his career.

Following his retirement, he was one of seventeen Cronulla players found guilty of using illegal substances under the club's 2011 supplements program, having a twelve-month suspension (which had already expired due to backdating) recorded against his name.