Nathan Williams (born 5 April 1976) is an Australian former professional rugby union player.
An Australia u-21s representative, Williams was primarily a fullback and winger, who played several seasons with the Queensland Reds in the Super 12. He scored two tries in a win over the NSW Waratahs in 2000 and was the top try scorer for the Reds in the 2001 season. From 2001 to 2003, Williams had overseas stints with Stade Français and Harlequins, then made a brief return at the Reds in 2004, before joining Japanese professional rugby.
Williams is the ex-husband of television presenter Tania Zaetta.