| Acronym | Definition |
|---|
| USO➣United Service Organizations (provides morale, welfare and recreation-type services to US uniformed military personnel) |
| USO➣United States Oil Fund (stock symbol) |
| USO➣Unión Sindical Obrera (Spanish: Workers Syndical Union; Spain) |
| USO➣Universal Service Obligation |
| USO➣University Symphony Orchestra (various universities) |
| USO➣Utah Symphony Orchestra (est. 1940) |
| USO➣Ultra Stable Oscillator |
| USO➣United Solar Ovonic (various locations) |
| USO➣United States Open |
| USO➣Universal Service Order |
| USO➣Unilateral Salpingo-Oophorectomy (surgical procedure) |
| USO➣United Stars Organisation (science fiction) |
| USO➣Universitair Symfonisch Orkest (University Symphony Orchestra; Leuven, Belgium) |
| USO➣Unidentified Submarine Object |
| USO➣Unit Security Officer |
| USO➣Unidentified Submersible Object |
| USO➣Unique Sink Orientation |
| USO➣Unix Software Organization |
| USO➣Union Sportive Oyonnax (French sports organization) |
| USO➣Unidentified Superconducting Object |
| USO➣Union Sportive Orléans (French sports organization) |
| USO➣Utsjoen Sähköosuuskunta (electric supplier company of Utsjoki, Finland) |
| USO➣Unidentified Sliding Object (vehicle) |
| USO➣Under Secretary of the Navy's Office (US Navy) |
| USO➣Undercover Special Operations |