| Acronym | Definition |
|---|
| SWO | Spaghetti Western Orchestra (band) |
| SWO | Single Window Operator |
| SWO | Supercritical Water Oxidation |
| SWO | Standing-Wave Oscillator |
| SWO | Symphonic Wind Orchestra (various locations) |
| SWO | Southwestern Ontario (various organizations; Canada) |
| SWO | Serial Wire Output |
| SWO | Short Wave Optical |
| SWO | Session Work Object |
| SWO | Simulation World Object |
| SWO | Southwest Ohio |
| SWO | Swordfish (FAO fish species code) |
| SWO | South West Observatory (UK) |
| SWO | SoftwareONE (various locations) |
| SWO | Surface Warfare Officer |
| SWO | Sine Wave Orchestra (Japan) |
| SWO | Stop Work Order |
| SWO | Senior Warrant Officer |
| SWO | Senior Watch Officer |
| SWO | SeaWorld Orlando (Florida) |
| SWO | Swaminarayan World Organization |
| SWO | Service Work Order |
| SWO | Swainarayan World Organization |
| SWO | Socialist Workers Organisation (New Zealand) |
| SWO | Software Override |
| SWO | Snowbird Wilderness Outfitters (Andrews, NC youth camp) |
| SWO | Susquehanna Wrestling Organization (York, PA) |
| SWO | Senior/Staff Watch Officer |
| SWO | Student Welfare Officer |
| SWO | Social Welfare Organization |
| SWO | Staff Weather Office(r) |
| SWO | Staff Welfare Officer (UK) |
| SWO | Sorry, We're Open (webcomic) |
| SWO | Strategic Workforce Optimization |
| SWO | Safety Word Orange (band) |
| SWO | Security Watch Officer |
| SWO | Special Weapons Officer |
| SWO | Squadron/Station Warrant Officer |
| SWO | Safe Worker Observation (Massachusetts) |
| SWO | Softball World Order (Arlington County, Virginia) |
| SWO | Sonic World Order |
| SWO | Stoners World Order |
| SWO | Space Wars Online (gaming) |
| SWO | Stillwater, Oklahoma, USA - Stillwater Regional Airport |