| Term | Full Form | Category |
|---|---|---|
| UIU | Understanding the Integral Universe | Others |
| UIU | Unidentified Internet User | Others |
| UIU | United International University | Others |
| UIU | Universal Imaging Utility | Others |
| UIU | Universal Industries Unlimited, Inc. | Others |
| UIU | Unusual Incidents Unit | Others |
| UIU | Upholsterers International Union | Others |
| UIU | Upholsterers International Union of North America | Others |
| UIU | Upper Iowa University | Others |
| UIU | Upper Iowa University's | Others |
| UIU | User Interface Unit | Others |