USAN
| Acronym | Definition |
|---|---|
| USAN | Union of South American Nations (intergovernmental association) |
| USAN | United States Adopted Name |
| USAN | United States Advanced Network (est. 1989; Norcross, GA) |
| USAN | University Satellite Network |
| USAN | Univalue Segment Assimilating Nucleus |
| USAN | United States African Network |
| USAN | United States Approved Name (pharmaceuticals) |