The Oceania Cooperative Union (OCU) is a supranational union of countries in Southeast Asia, Oceania, and Australia. The OCU capital, where the OCU Central Parliament located, is Canberra, Australia. The union's roots date back to 2006, when the Association of Southeast Asian Nations reorganized itself into the Bangkok Economic Alliance. The alliance is later renamed into the Oceania Cooperative Union in 2019 after Australia and Oceania decided to join the bloc. It is finally consolidated as a political union in 2026.