Greg Ray Theberge (born September 3, 1959 in Peterborough, Ontario) is a retired Canadian ice hockey player, and is the grandson of former NHL player and Hall of Famer Dit Clapper. A defenceman, Theberge was drafted 109th overall in 1979 by the Washington Capitals. He spent the next five seasons alternating between the Capitals and their Hershey Bears farm team. He played in 153 NHL games, scoring 15 goals and 63 assists. After 1984, Theberge spent three seasons in Europe and retired in 1987.