| Abbreviation | Definition |
|---|---|
| UOO | Unit Of Organization |
| UOP | Underserved Opportunities Program |
| UOW | Unit Of Work |
| UP | Unlimited Power |
| UPC | Uniform Plumbing Code |
| UPD | Unit for the Promotion of Democracy (Organization of American States) |
| UPE | Unsolicited Pornographic E-mail |
| UPG | Unclassified Personnel Guidelines |
| UPI | Unidentified Party Injury |
| UPI | Unwarranted Punishment of Innovation |
| UPL | Unauthorized Practice Of Law |
| UPL | Upper Payment Limit |
| UPN | Unique Property Number |
| UPU | Universal Postal Union |
| UPW | United Public Workers |
| UQC | Unacceptable Quality Control |
| UQI | Unacceptable Quality Inspection |
| UQI | Universal Quality Index |
| UQP | Un- Qualified Program |
| UQS | Unified Quality Specification |