| Acronym | Definition |
|---|
| USN | United States Navy |
| USN | Ultrasound |
| USN | Ubuntu Security Notice (computer security) |
| USN | Ubiquitous Sensor Network |
| USN | Unified Social Network |
| USN | Update Sequence Number |
| USN | Unique Service Name |
| USN | Update Sequence Number (Microsoft Windows 2000) |
| USN | University School of Nashville (Nashville, TN) |
| USN | Ulsan, South Korea (Airport Code) |
| USN | United States Note |
| USN | Ultrasonic Nebulizer |
| USN | Universal Space Network, Inc |
| USN | Ultrasonic Nebulization |
| USN | Usual Suspects Network (website) |
| USN | United Space Network |
| USN | United States of New Continent (Front Mission game series) |
| USN | Unity. Service. Navigation. (US Navy emblem) |
| USN | Université Sorbonne Nouvelle (French university) |
| USN | Universal Student Number |