| Abbreviation | Definition |
|---|---|
| UCGY | United Church of God Youth |
| UCH | Unitarian Church of Hinsdale |
| UCHS | Unity Christian High School |
| UCJ | Universal Cycle of Joy |
| UCM | Union of Catholic Mothers |
| UCM | United Community Ministries |
| UCMC | Universal Christian Ministry and Church |
| UCMU | Unitarian Congregation of Mendon and Uxbridge |
| UCN | Unitarian Church North |
| UCO | Université Catholique de l'Ouest |
| UCO | University Christian Outreach |
| UCP | Urban Church Planting |
| UCPC | Union Church Presbyterian Church |
| UCPC | Union Cumberland Presbyterian Church |
| UCV | United Church of the Valley - Murrieta, California |
| UCW | United Christian Workers |
| UCW | United Church Women |
| UCWA | United Christian Workers Association |
| UD | Ultimate Destiny |
| UDT | United Deliverance Temple |