Geraint Howell Thomas, MBE (born 25 May 1986) is a Welsh professional racing cyclist who rides for the UCI WorldTeam Team Sky, Wales and Great Britain.
Thomas has enjoyed success both on the track and on the road. On the track he is a former world champion and Olympic gold medalist in the team pursuit in 2008 and 2012. Thomas' is the current Commonwealth road champion and has tasted success at the 2004 Junior Paris–Roubaix, through to senior victories at the 2010 British National Road Race Championships. Thomas has also achieved stage race overall victories; the 2011 & 2014 Bayern-Rundfahrt and the 2016 Paris–Nice, as well as winning his first semi-classic, the 2015 E3 Harelbeke.
Born in Birchgrove, Cardiff, Thomas attended Whitchurch High School. He began cycling with the Maindy Flyers Cycling Club at Maindy Stadium at the age of 10, where he rode with future Team Sky team-mate Luke Rowe, before going on to ride for other local clubs, Cycling Club Cardiff and Cardiff Just in Front. His first race bike was a blue Giant. Following some successes in under 14 and under 16 events, including National Championships, his first notable success came when he won silver medal in the points race at the European Championships.