| USO | Ultra Stable Oscillator 
| Others |
| USO | Uluslararasi Standartlar Orgutu
| Others |
| USO | Unconfirmed Stories Organization
| Others |
| USO | Understanding Strengthening and Overcoming
| Others |
| USO | Understanding Strengthening Overcoming
| Others |
| USO | Understanding the Situation of Others
| Others |
| USO | Unidentified Submarine Object
| Others |
| USO | Unidentified Sunken Object
| Others |
| USO | Unidentified Superconducting Object
| Others |
| USO | Unified Sign On
| Others |
| USO | Unilateral Salpingo-Oophorectomy
| Others |
| USO | United Samoan Organization
| Others |
| USO | United Service Organization
| Others |
| USO | United Service Organizations
| Others |
| USO | United Services Organization
| Others |
| USO | United Services Organizations
| Others |
| USO | United States Oil
| Others |
| USO | United States One
| Others |
| USO | United States Organizations
| Others |
| USO | United States Overseas
| Others |
| USO | Universal Service Obligation
| Others |
| USO | Universal Service Order
| Others |
| USO | Unix Software Operation
| Others |
| USO | Unless Stated Otherwise
| Others |
| USO | UnStarted Object
| Others |
| USO | Unverified Southern Object
| Others |
| USO | Update Orchestrator Service
| Others |
| USO | Update Session Orchestrator
| Others |
| USO | Use Search Option
| Others |