United Nations and International Union refers to multiple organizations in the Ace Combat franchise:
- Neo United Nations, a multinational Strangereal organization depicted in Ace Combat 3: Electrosphere
- IUN, a multinational Strangereal organization sometimes referred to as the United Nations, depicted primarily in Ace Combat 7: Skies Unknown
- International Union Peacekeeping Force, a multinational organization depicted in Ace Combat: Joint Assault
- United Nations (Infinity), the multinational organization in our real world depicted in Ace Combat Infinity
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