Clifford Charles Devlin Thorburn, CM known as Cliff Thorburn (born January 16, 1948) is a retired professional Canadian snooker player. A former 'World Number One' (one of only ten players to hold that spot), he was 'World Snooker Champion' in 1980, one of only three players from outside the United Kingdom to win the world title in the modern era (along with Ken Doherty and Neil Robertson). In 1983, Thorburn became the first player to compile a maximum break at the world championships. His slow, determined style of play earned him the nickname "The Grinder".

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