| Abbreviation | Definition |
|---|---|
| UHR | United Human Resources, Inc. |
| UHS | United Health Services |
| UHS | Universal Hospital Services, Inc. |
| UHT | Ukrainian High Technologies |
| UHW | Ultimate Hardcore Wrestling Entertainment, Inc. |
| UHY | Urbach Hacker Young, Accountants |
| UI | Umbrella, Inc. |
| UI | United Illuminating |
| UIA | Union Industrial Argentina |
| UIA | Universal Investment Agency |
| UIB | United Insurance Brokers Pte, Ltd. |
| UIC | Ukpea!vik Iñupiat Corporation |
| UIC | Ukpeagvik Iñupiat Corporation |
| UIC | United International Company Inc. |
| UIC | Universal Instruments Corporation |
| UIC | Urban Improvement Company |
| UIFC | United Financial Corporation |
| UIFC | University Islamic Financial Corporation |
| UIG | United Insurance Group |
| UIG | Universal Industrial Gases, Inc. |