David George Irwin (born 1 February 1959) is a former rugby union player who played for Ireland and the British Lions.
Between 1980 and 1990, Irwin made 25 appearances for Ireland, scoring 8 points including 2 tries. Helped Ireland win the 1982 Five Nations Championship and a Triple Crown.
In 1983 Irwin was also a member of the Lions squad that went on tour to New Zealand.
Irwin is currently the medical coordinator for Ulster Rugby, as well as being a practising GP in Belfast.