USIR
| Acronym | Definition |
|---|---|
| USIR | University of Salford Institutional Repository (UK) |
| USIR | United States Internal Revenue (watermark error; stamps) |
| USIR | United States Inter-Regional (dance) |
| USIR | Utah School Immunization Record (Utah Department of Health) |
| USIR | Upper Silesian Industrial Region (Poland) |