Bryn Day (24 November 1919 – 26 September 1977) was a Welsh rugby union, and professional rugby league footballer who played in the 1940s and 1950s. He played club level rugby union (RU) for Bridgend RFC, and representative level rugby league (RL) for Wales, and at club level for Warrington (Heritage No.), and Oldham (Heritage № 557), as a , or , i.e. number 8 or 10, or 13, during the era of contested scrums.
