Haydn Tanner (9 January 1917 – 5 June 2009)[2] was a Welsh international rugby union player who represented both Wales and the British and Irish Lions.

At club level, he played for several top-flight teams, including Bristol, Cardiff, Swansea, London Welsh and the Barbarians.

Tanner was educated at Gowerton Grammar School and was still a schoolboy when he played at scrum-half for Swansea against the All Blacks at St. Helens in 1935.

Tanner toured South Africa with the British and Irish Lions in 1938 and played in only one test owing to injury.

After retiring from rugby, he became an industrial chemist working in the wood pulp trade for Thompson and Norris.