| Abbreviation | Definition |
|---|---|
| UCITA | Uniform Computer Information Transaction Act |
| UCJ | Utah Coalition for Justice |
| UCN | Universal Common Name |
| UCR | Uniform Case Record |
| UCR | Uniform Crime Reporting |
| UD | Under Duress |
| UD | Unlawful Detainer |
| UDL | Universal Description of Legalism |
| UDS | Urban Death Squad |
| UDT | Under Declaration of Trust |
| UEJ | Unidad de Estudios Jurídicos |
| UEN | Underaged English Nutters |
| UEO | Universal Enforcement Operations |
| UES | Urban Electro Squad |
| UEVHPA | Uniform Emergency Volunteer Health Practitioners Act |
| UFO | Undercover Fencing Operation |
| UFV | Unidentified Female Voice |
| UHJ | Universal House of Justice |
| UHT | Under Hood Teenagers |
| UIA | Union Internationale des Avocats |