|Born||27 February 1984|
|Height||1.85 m (6 ft 1 in)|
|Weight||73 kg (161 lb; 11 st 7 lb)|
Williams was born in Bridgend, the son of former Welsh international rugby union player J.J. Williams. Rhys studied at Ysgol Gyfun Llanhari from September 1995 until June 2002. 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. He is currently studying for a master's degree at the University of Glamorgan.[when?]
Williams won the 400 m hurdles at the 2005 European U23 Championships, was European Junior Champion in 2003, and won the European Youth Olympics in 2001.
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). He also ran 48.3 over the 400 m (2002).
On 17 June 2008 it was announced that he would miss the 2008 Olympics due to a stress fracture to his right foot. He suffered the injury while taking part in the Welsh Championships two days earlier, which was the first time he had competed since suffering a similar injury a year earlier.
On 25 July 2014, on the second day of the 2014 Commonwealth Games where he was co-captain of the Welsh team, it was announced that he was suspended from all competition because of a doping violation at the Glasgow Grand Prix on 11 July. In January 2015 UK Anti-Doping gave Williams a four-month suspension, whilst accepting that Williams' positive test was due to taking a contaminated supplement and that he had not knowingly cheated. As Williams had already been suspended for more than six months the decision meant that he was free to compete again.
|400m||46.69s||Newport||25 May 13|
|400mH||48.84s||Luzern, SUI||17 Jul 13|
- "BBC SPORT | Olympics | Athletics | Injured Williams out of Olympics". BBC News. 17 June 2008. Retrieved 8 July 2012. CS1 maint: discouraged parameter (link)
- "BBC SPORT - Glasgow 2014: Rhys Williams suspended over doping violation charge". BBC News. 25 July 2014. Retrieved 25 July 2014. CS1 maint: discouraged parameter (link)
- "Rhys Williams and Gareth Warburton 'have served drug bans'". bbc.co.uk. 17 January 2015. Retrieved 18 January 2015. CS1 maint: discouraged parameter (link)