David John Llewellyn (born 18 November 1951) is a Welsh professional golfer. Llewellyn played on the European Tour in the 1970s after being named the Sir Henry Cotton Rookie of the Year in 1971. He achieved a personal best ranking of 39th on the Order or Merit in 1974, but did not win any tournaments in this period. After a spell as a club professional at Craythorne Golf Centre (1975–78), Royal Malta Golf Club (1978–81) and Thirsk and Northallerton Golf Club (1982–84), he returned to tournament golf in 1984, and collected several tournament victories during the following years. His sole win on the main European Tour was the 1988 AGF Biarritz Open, when he set a tour record four round total of 258. The scoring record was tied by Llewellyn's countryman Ian Woosnam in 1990 and not beaten unti