George Gray Cook was a rugby union and rugby league player. Cook played for Horowhenua at rugby union, before moving to Wellington and playing for Wellington before switching codes. He played 2 matches for the New Zealand rugby league team in 1912–13. In so doing he became the 86th player to represent New Zealand at rugby league. He also played rugby league for Wellington, before moving to Auckland and playing for Newton Rangers, Otahuhu and Auckland. He enlisted in the army for World War I and died in France in 1918.