Rhys Williams (born 27 February 1984), is a Welsh professional track and field athlete, specializing in the 400 m hurdles.

He was a member of the Bridgend and District D.C. Thomas winning rugby side at the age of 11 and was also the Welsh U15 backstroke swimming champion.

On 10 August 2006, Williams won the bronze medal at the European Championships in Athletics in Gothenburg in a time of 49.12 seconds, thus just slightly missing his personal best (49.09, set at the 2006 Commonwealth Games in Melbourne, where he finished fourth).

On 13 August 2006 at that same event, he won a silver medal in the 4x400 m relay as the second sprinter, along with Robert Tobin, Graham Hedman and Timothy Benjamin, in a time of 3:01.63.

On 31 July 2010, he achieved the Silver Medal in the 400 m hurdles at the European Athletics Championships in Barcelona, with fellow Welshman Dai Greene winning Gold.