| Acronym | Definition |
|---|
| TSO➣Time Sharing Option |
| TSO➣Telecommunications Service Order |
| TSO➣The Stationery Office (UK) |
| TSO➣Trans-Siberian Orchestra (band) |
| TSO➣Transportation Security Officer |
| TSO➣Toronto Symphony Orchestra (Canada) |
| TSO➣Technical Standard Order |
| TSO➣Trattamento Sanitario Obbligatorio (Italian: Compulsory Health Treatment) |
| TSO➣Technical Support Organization (various organizations) |
| TSO➣Tokyo Symphony Orchestra (Japan) |
| TSO➣The Sims Online (gaming) |
| TSO➣Toledo Symphony Orchestra (Toledo, OH) |
| TSO➣Tcp Segmentation Offload |
| TSO➣Tasmanian Symphony Orchestra |
| TSO➣Transmission System Operator (energy) |
| TSO➣Teamspeak Overlay (gaming) |
| TSO➣Texas State Optical (Houston, Texas) |
| TSO➣The Sith Order (Roblox) |
| TSO➣Technisch Secundair Onderwijs (Dutch) |
| TSO➣Time Schedule Order (various locations) |
| TSO➣The Shadow Odyssey (gaming; EverQuest) |
| TSO➣Time Since Overhaul |
| TSO➣Telecommunications Service Obligations (New Zealand) |
| TSO➣The Special One (nickname of Jose Mourinho) |
| TSO➣Trading Standards Officer |
| TSO➣Temporary Suspension Order (various locations) |
| TSO➣Technical Support Office |
| TSO➣Total Shares Outstanding |
| TSO➣Trondheim Symphony Orchestra (Norway) |
| TSO➣Trichuris Suis Ova (pig whipworm eggs) |
| TSO➣Total Store Ordering (SPARC architecture consistency model) |
| TSO➣Taipei Symphony Orchestra (Taiwan) |
| TSO➣Technical Service Order |
| TSO➣Technical Services Operations |
| TSO➣Turn Stuff Off (energy conservation campaign; US DoD) |
| TSO➣The Smarter One |
| TSO➣TCP (Transmission Control Protocol) Segmentation Offload (computer networking) |
| TSO➣The Speakeasy Offensive (Counter-Strke team) |
| TSO➣Tempe Symphony Orchestra (Tempe, AZ) |
| TSO➣Time Stamp Ordered |
| TSO➣Tactical Sensor Operator (military aviation) |
| TSO➣Technical Staff Officer |
| TSO➣Tight Shut Off (emergency system valve feature) |
| TSO➣Trial Services Office (US military) |
| TSO➣Terminal Security Officer |
| TSO➣Third Sector Organization (non-profit) |
| TSO➣Tactical Systems Officer |
| TSO➣Transfer Student Ombudsperson (Maricopa County, AZ community college system) |
| TSO➣Technology Spillovers |
| TSO➣Temporary Standing Order (US DoD) |
| TSO➣Temporary Slow Order (railway) |
| TSO➣Transportation Supply Officer |
| TSO➣Town Sub-Office |
| TSO➣Tactical Support Operations |
| TSO➣Thru-Short-Open |
| TSO➣Telephone Service Observation |
| TSO➣Transmission Systems Operations/Operator (telecommunications) |
| TSO➣Test Support Office |
| TSO➣Timberline Symphony Orchestra (Lafayette, CO) |
| TSO➣Transaction Server Operation |