David Brynmor Williams (born 29 October 1951 in Cardigan) 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' rugby union international, and club appearances were limited by the presence of first Gareth Edwards, and then Terry Holmes in the same teams.
He was capped three times for Wales (RU), and three times for the British Lions (RU).
In 1977 he toured New Zealand with the British and Irish Lions when he had yet to be capped by Wales.
His only two other appearances for Wales came in the 1981 Five Nations championship.
Williams played club rugby for Cardiff RFC, Swansea RFC and Newport RFC.His sons Lloyd Williams and Tom Williams are both professional rugby union players.
Williams is Welsh-speaking and is sometimes called upon as a pundit in the Welsh-language media.
In 2016 Williams took up the voluntary role as Chair of Fields in Trust Cymru, a charity dedicated to protecting outdoor space for play, sport and recreation.