John Albert Gwilliam (28 February 1923 – 21 December 2016) was a Welsh rugby union player and schoolteacher. As a "No. 8" he played international rugby for Wales and club rugby for Cambridge University, Edinburgh Wanderers, Gloucester, Newport, London Welsh, Llanelli and Wasps. He captained the Wales rugby union team when they achieved Grand Slam victories in the 1950 and 1952 Five Nations Championships.