Clifford Charles Devlin Thorburn CM, known as Cliff Thorburn (born January 16, 1948 in Victoria, British Columbia) is a retired professional Canadian snooker player. A former world number one (one of only seven 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 147 maximum break at the world championships. His slow, determined style of play earned him the nickname "The Grinder".