| Abbreviation | Definition |
|---|---|
| UHW | Under His Wings |
| UIA | Universitas Islam As-syafi'iyah |
| UIBC | Union of Italian Baptist Churches |
| UID | Universitas Islam Jakarta |
| UIFC | University Islamic Financial Corporation |
| UII | Universitas Islam Indonesia |
| UIM | Urban Impact Ministries |
| UIR | Universitas Islam Riau |
| UISI | Universitas Islam Sumatra Utara |
| UIT | Universitas Islam Tribakti |
| UIW | University of the Incarnate Word |
| UJC | United Jewish Council |
| UJCC | Uganda Joint Christian Council |
| UJCC | Ugandan Joint Christian Council |
| UJPO | United Jewish People's Order |
| UJY | Union of Jewish Youth |
| UKCF | United Korean Christian Fellowship |
| ULC | Universal Life Church |
| ULC | University Lutheran Chapel |
| ULCC | University of London Church Choir |