The Chatham Cup, is a knockout competition in New Zealand football, organised by New Zealand Football. It is the oldest existing football competition in New Zealand, having commenced in the 1923 season. The tournament is open to all clubs in New Zealand football league system, although a club may only enter one team into the tournament. Secondary schools are also eligible to enter. The competition culminates at the end of the league season (usually in September) with the Chatham Cup Final.