| Abbreviation | Definition |
|---|---|
| UPGI | United Promotions Group, Inc. |
| UPHU | Union Pacific Railroad Company |
| UPI | United Phosphorus Inc |
| UPI | United Phreakers Incorporated |
| UPI | United Piping Inc |
| UPI | United Producers Inc |
| UPI | United Promotions Inc |
| UPI | Unlimited Potential Inc |
| UPI | Unreel Productions Inc |
| UPK | University Press of Kentucky |
| UPL | United Phosphorus Ltd |
| UPLK | Unit Perantara Layanan Keuangan |
| UPM | United Paper Mills |
| UPMT | Udu Point Meridian Trust |
| UPO | United Planning Organization |
| UPO | United Property Owners |
| UPP | Unlimited Performance Products |
| UPPC | Uganda Printing and Publishing Corporation |
| UPPC | University Park Plaza Corporation |
| UPPCL | Uttar Pradesh Power Corp Ltd |