OE may refer to

• Obsidian Entente - A Short-lived alliance created by the Viridian Entente in the black color sphere;
• Oceanic Entente - The Obsidian Entente turned into this alliance shortly after it's creation and it out lived the 1st Viridian Entente but eventually disbanded; or
• The post nominal letters a Member or Honorary Member of Order of Eagleia is entitled to.

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