- UNRWA
- Acronym:United Nations Relief and Works Agency
- UNSCOM
- Item for:United Nations Special Commission
- UNSCR
- Abbreviation:United Nations Security Council Resolution
- UNSMA
- Acronym:United Nations Special Mission in Afghanistan
- UNTAES
- Acronym:United Nations Transitional Authority in Eastern Slavonia
- UNTEA
- Acronym:United Nations Temporary Executive Authority
- UNTSI
- Acronym:United Nations Training School Ireland
- UNTSO
- Acronym:United Nations Truce Supervision Organisation
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