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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