Iwan Thomas, Welsh sprinter and coach
Iwan Gwyn Thomas (born 5 January 1974) is a British 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 m relay) champion.

Thomas is the current UK 400m record holder, having run a time of 44.36s in Birmingham on 13 July 1997. He was also a member of the team which holds the UK 4 × 400 m Relay record of 2:56.60, set in Atlanta, USA in the Olympic final on 3 August 1996.

Thomas's coach for much of his running career was Mike Smith, formerly coach to British 400 m runners Roger Black, Todd Bennett and Paul Harmsworth also hurdler Kriss Akabusi. Thomas was made a Member of the Order of the British Empire (MBE) in 1998.