| Abbreviation | Definition |
|---|---|
| UIH | Underwriters Indemnity Holdings, Inc. |
| UIH | United International Holdings, Inc. |
| UII | Unified Industries Incorporated |
| UIIC | United India Insurance Company |
| UIIC | United India Insurance Company Limited |
| UIIC | Uzbekinvest International Insurance Company |
| UIL | Unlimited Intelligence Limited |
| UIM | Unique Internet Media |
| UIM | User in Mind Creative Group, Inc. |
| UIMC | United Instrument Manufacturing Corporation |
| UIP | United International Pictures |
| UIQ | Unique Intelligence Quotient |
| UIR | Universal Industrial Refrigeration, Inc. |
| UIR | User Interface Research |
| UIRC | Urban Investment Research Corporation |
| UiS | University Information Systems |
| UISER | User Interaction SERvices |
| UIU | Universal Industries Unlimited, Inc. |
| UIW | United Indian Websites |
| UIW | United Industrial Workers |