| Abbreviation | Definition |
|---|---|
| UCA | United Court of Austin, Inc. |
| UCA | Uttarakhand Cultural Association, Canada |
| UCAF | Ukraine Children's Aid Fund |
| UCAN | Utility Consumers' Action Network |
| UCAR | University Corporation for Atmospheric Research |
| UCCA | Ukrainian Congress Committee of America |
| UCCA | Unified Child Care Agencies |
| UCCF | Universal Concerned Citizens' Fonds |
| UCE | Unbreakable Camp Enterprise |
| UCF | Urgent Care Fund |
| UCFF | Ucffunited Crowd Funding Foundation |
| UCFREF | United Cerebral Palsy Research and Educational Foundation |
| UCP | United Cerebral Palsy Association |
| UCPAH | United Cerebral Palsy Association of Hawaii, Honolulu |
| UCP-M | United Cerebral Palsy Association of Michigan |
| UCPSF | United Cerebral Palsy of South Florida |
| UCSJ | Union of Councils for Jews in the Former Soviet Union |
| UCSUT | Universalist Church School Union Trust |
| UDC | United Daughters of the Confederacy |
| UDCA | US Deaf Cycling Association |