| TSO | Tactical Support Operations 
| Others |
| TSO | Tactical Systems Officer
| Others |
| TSO | Tailored Systems Offering
| Others |
| TSO | Take System Over
| Others |
| TSO | Tal Sexual Outlet
| Others |
| TSO | Tallahassee Symphony Orchestra
| Others |
| TSO | Taxpayer Service Office
| Others |
| TSO | TCP segmentation offload
| Others |
| TSO | Team Support Officer
| Others |
| TSO | Technical Service Order
| Others |
| TSO | Technical Services Office
| Others |
| TSO | Technical Services Organization
| Others |
| TSO | Technical Staff Officer
| Others |
| TSO | Technical Standard Order
| Others |
| TSO | Technical Standard Orders
| Others |
| TSO | Technical Standards Order
| Others |
| TSO | Technical Support Officer
| Others |
| TSO | Technical Support Operations
| Others |
| TSO | Telecommunications Service Order
| Others |
| TSO | Terminal System Operation
| Others |
| TSO | Terminating Service Office
| Others |
| TSO | Territory Sales Officer
| Others |
| TSO | Texas State Optical
| Others |
| TSO | The Sanford Organization
| Others |
| TSO | The Seraphim Order
| Others |
| TSO | The Sick One
| Others |
| TSO | The Sims Online
| Others |
| TSO | The Smarter One
| Others |
| TSO | The Stationary Office
| Others |
| TSO | The Stationery Office
| Others |
| TSO | The Stationery Office (formerly Her Majesty's Stationery Office)
| Others |
| TSO | The Sun Organization
| Others |
| TSO | Thierry Sabine Organisation
| Others |
| TSO | Third sector organisations
| Others |
| TSO | This Side of
| Others |
| TSO | Timberwolf Support Organization
| Others |
| TSO | Time Saving Option
| Others |
| TSO | Time Share Option
| Others |
| TSO | Time Sharing Operating
| Others |
| TSO | Time Sharing Operation
| Others |
| TSO | Time Sharing Option
| Others |
| TSO | Time Sharing Opttion
| Others |
| TSO | Time Since Overhaul
| Others |
| TSO | Time Spent Online
| Others |
| TSO | Toledo Symphony Orchestra
| Others |
| TSO | Tony Stelliga And Omologato
| Others |
| TSO | Top Secret Organization
| Others |
| TSO | Toronto Symphony Orchestra
| Others |
| TSO | Touring Sport Omologato
| Others |
| TSO | Toyota Starlet Owners
| Others |
| TSO | Trading Standards Officer
| Others |
| TSO | Trans Siberian Orchestra
| Others |
| TSO | Trans-Siberian Orchestra
| Others |
| TSO | Transient Spastic Occlusion
| Others |
| TSO | Transition (to) Stabilized Occupancy
| Others |
| TSO | Transmission System Operator
| Others |
| TSO | Transportation Security Officer
| Others |
| TSO | Transportation Systems Operations
| Others |
| TSO | Trattamento Sanitario Obbligatorio
| Others |
| TSO | Travel Safe Officers
| Others |
| TSO | Tresco, Isles of Scilly
| Others |
| TSO | TRICARE Support Office
| Others |
| TSO | Trichuris Suis Ova
| Others |
| TSO | Trisun Sunflower Oil
| Others |
| TSO | Truck Stop Operator
| Others |
| TSO | Tucson Symphony Orchestra
| Others |
| TSO | Tulsa Symphony Orchestra
| Others |
| TSO | Tundra Sales Organization
| Others |
| TSO | Turkish Supported Opposition
| Others |
| TSO | Tyan System Operator
| Others |
| TSO | Type Standardization Orders
| Others |