Ceiron Thomas (born 23 October 1983) is a Welsh former rugby union footballer who played for the Scarlets, Leeds Carnegie, Cornish Pirates, and St Ives RFC.
Thomas began his rugby career with the Llanelli-based Scarlets, and made his debut for the region in 2003 when he played in a friendly against the Slovenia national team.
Again, he only made two more appearances in the 2005–06 season but managed to hold down a place in the side for the 2006–07 Magners League, sharing duties at fullback with Barry Davies and Morgan Stoddart.
Thomas began the 2007–08 Magners League as the Scarlets' starting fly-half, while regular number 10 Stephen Jones was on Wales duty at the 2007 Rugby World Cup in France, but lost the berth to rival fly-half Rhys Priestland before Jones' return.
Thomas only made six appearances for the Scarlets in 2009, resulting in a transfer to Leeds Carnegie in June 2009.