| Abbreviation | Definition |
|---|---|
| U | Uninduced |
| U | Unlucky |
| U | Unredacted |
| U/A | Under Advisement |
| U/T/D | Under Trust Dated |
| UA | Under Agreement |
| UA | Urine analysis |
| UA | User Authored |
| UAA | Uniform Adoption Act of 1994 |
| UAD | Under- Age Drinking |
| UAD | Under Agreement Dated .... |
| UAG | Urban Assault Group |
| UAK | Unbreakable Assassin Killer |
| UALS | Ukrainian Academy of Law Sciences |
| UB | The Universal Brotherhood |
| UB | Upper Body |
| UBE | Uniform Bar Examination |
| UBI | Unexplained Beer Injury |
| UBP | Unified Ban Policy |
| UBP | Universal Body Protection |