Doug Mountjoy (8 June 1942 – 14 February 2021) was a Welsh snooker player from Tir-y-Berth, Gelligaer, Glamorgan, Wales. He was a mainstay of the professional snooker circuit during the late 1970s and 1980s, and remained within the top 16 of the world rankings for 11 consecutive years. He began his professional snooker career by winning the 1977 Masters, which he had entered as a late replacement. He won the 1978 UK Championship and the 1979 Irish Masters, and reached the final of the 1981 World Snooker Championship where he lost to Steve Davis. He was also runner-up at the 1985 Masters, but by 1988 he had dropped out of the top 16.