Gwyn Williams (birth year unknown – death year unknown) was a Welsh rugby union and professional rugby league footballer who played in the 1930s. He played club level rugby union (RU) for Cardiff RFC, and representative level rugby league (RL) for Wales, and at club level for Wigan, as a wing, centre, or second-row, i.e. number 2 or 5, 3 or 4, or, 11 or 12, during the era of contested scrums.