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.

However the highlight of his career was perhaps winning the World Cup of Golf for Wales alongside Ian Woosnam in 1987.

Llewellyn left the tour for a second time in the early 1990s to return to being a club professional.

European Tour playoff record (0–1) Note: Llewellyn only played in The Open Championship.