Iwan Gwyn Thomas MBE (born 5 January 1974) is a Welsh sprinter who represented Great Britain and Northern Ireland at the Olympic Games in the 400 metres, and Wales at the Commonwealth Games. Thomas is a former European, Commonwealth Games and World 4 × 400 metres relay champion.
| Series | The Match | 2026 | |
| Series | The Weakest Link | Self | 2021-12-18 |
| Series | Richard Osman's House of Games | Self - Panellist | 2017-09-04 |
| Series | Celebrity Hunted | Self - Fugitive (Olympic sprinter & sports pundit) | 2017-10-10 |
| Series | The Last Leg | Self | 2013-01-25 |
| Series | Pointless Celebrities | Self | 2011-07-04 |
| Series | The McCain Track and Field Show | Unknown | 2009-07-26 |
| Series | Hole in the Wall | Unknown | 2008-09-20 |
| Series | Deadline | 2007-04-04 | |
| Series | Celebrity Masterchef | Self - Contestant | 2006-09-11 |
| Series | Celebrity Wrestling | 2005-04-23 | |
| Series | Best of Friends | Self - Presenter | 2004-03-11 |
| Series | Fifth Gear | Self | 2002-04-08 |
| Series | Soccer AM | Self | 1995-08-12 |
| Series | Ready, Steady, Cook | Self - Guest | 1994-10-24 |
| Series | Through the Keyhole | Unknown | 1987-04-03 |
| Series | Bullseye | Self - Special Guest | 1981-09-28 |