| Acronym | Definition |
|---|
| OUN➣Organization of Ukrainian Nationalists |
| OUN➣Order Unit |
| OUN➣Organizacija Ujedinjenih Nacija (Serbian: United Nations) |
| OUN➣Occasional Use Notices (UK; gambling law) |
| OUN➣Organizatsiya Ukrainskikh Natsionalistiv (Ukrainian: Organization of Ukrainian Nationalists) |
| OUN➣Oslo University Notation (Oslo, Norway) |