| Acronym | Definition |
|---|
| VSO | Very Superior Old (designation for brandy or port meaning it is between 12-17 years old) |
| VSO | Voortgezet Speciaal Onderwijs (Dutch: Secondary Special Education) |
| VSO | Voluntary Service Overseas |
| VSO | Vente sur Offres (French: On Sale Offers) |
| VSO | Vancouver Symphony Orchestra |
| VSO | Video Switching Office |
| VSO | Visual Simulation Object |
| VSO | Vendor Specific Option |
| VSO | Very Small Outline |
| VSO | Variable Speed Operation |
| VSO | Veterans Service Organization |
| VSO | Vessel Security Officer (US Coast Guard) |
| VSO | Vita Standards Organization |
| VSO | Violin Shaped Object |
| VSO | Veterans Services Office |
| VSO | Virtual Solar Observatory |
| VSO | Virginia Society of Ornithology (est. 1929) |
| VSO | Volunteer Service Organization (United Kingdom) |
| VSO | Verb Subject Object |
| VSO | Voluntary Service Organisation |
| VSO | Vienna Symphony Orchestra (Austria) |
| VSO | Vocational Student Organization |
| VSO | Variable Speed Operation (VXA Technology) |
| VSO | Video Serving Office |
| VSO | Very Small Outline (package) |
| VSO | Very Stable Oscillator (US NASA) |
| VSO | Virginia State Open (dance competition) |
| VSO | Scout Observation Plane (US Navy) |
| VSO | Volumetric Shutoff (aviation) |
| VSO | Vendor Specific Option (computer science) |
| VSO | Village Stability Operations (US and Afghanistan) |
| VSO | Valdosta Southern Railroad |
| VSO | Voltage Sensitive Orifice |
| VSO | Scouting/Observation Squadron (US Navy, World War II) |
| VSO | Vlaamse Sorteerders Organisatie (Dutch: Flemish Sorters' Organization) |
| VSO | Virtual Service Offering (network management) |
| VSO | Variable-Sweep Oscillator |
| VSO | Video Systems Organization (GTE) |
| VSO | Stalling Velocity in the Landing Configuration after Take-Off |