David Brynmor Williams MBE (born 29 October 1951) is a Welsh dual-code international rugby union, and professional rugby league footballer. He played representative level rugby union (RU) for British Lions and Wales, at invitational level for Barbarian F.C., and at club level for Cardiff RFC, Newport RFC and Swansea RFC, as a Scrum-half, i.e. number 9, and representative level rugby league (RL) for Wales, and at club level for Cardiff City (Bridgend) Blue Dragons, as a scrum-half, i.e. number 7. Williams played club rugby for Cardiff RFC, Swansea RFC and Newport RFC.