| Acronym | Definition |
|---|
| TOS➣Teacher Over Shoulder (chat) |
| TOS➣Terms Of Service |
| TOS➣Temporarily Out of Stock |
| TOS➣The Original Series (Star Trek) |
| TOS➣The Other Side |
| TOS➣Type Of Service |
| TOS➣Tales of Symphonia (video game) |
| TOS➣The Operating System |
| TOS➣The Opposite Sex |
| TOS➣Thoracic Outlet Syndrome |
| TOS➣Town of Salem (gaming) |
| TOS➣Tales of Suspense (comic) |
| TOS➣Toshiba Corporation (stock symbol; Japan) |
| TOS➣Talend Open Studio (software) |
| TOS➣Terminal Operating System |
| TOS➣The Obesity Society (est. 1982; Silver Spring, MD) |
| TOS➣The Old Schoolhouse (magazine) |
| TOS➣Terminate on Sight (G-Unit album) |
| TOS➣Temple of Set |
| TOS➣Temporarily Out of Service |
| TOS➣The Objective Standard |
| TOS➣Tennessee Ornithological Society (est. 1915) |
| TOS➣Top of the Stack |
| TOS➣Tape Operating System |
| TOS➣the Other Service |
| TOS➣Tape on Substrate |
| TOS➣Testing Operation System |
| TOS➣Technical and Office Systems |
| TOS➣Temporary Out of Service |
| TOS➣Taligent Object Services |
| TOS➣the Other Spammers |
| TOS➣Top of Stack |
| TOS➣Tiny Operating System |
| TOS➣Transactions on Storage |
| TOS➣The Oceanography Society |
| TOS➣Technical Operations Specialist (various companies) |
| TOS➣Trial of Scar (obstetrics) |
| TOS➣Terminate on Site |
| TOS➣Tactical Operations System |
| TOS➣Theosophical Order of Service (est. 1908) |
| TOS➣Tactical Operations Support (US TSWG) |
| TOS➣Terminal Operation System |
| TOS➣Time of Sale |
| TOS➣Title of Show (musical) |
| TOS➣Task Order Solicitation (engineering; Los Angeles, CA) |
| TOS➣Treatment Outcome Score (healthcare) |
| TOS➣Tramiel Operating System (Atari ST/TT operating system) |
| TOS➣Time On Station |
| TOS➣Trusted Operating System |
| TOS➣Transfer Orbit Stage |
| TOS➣Technician on Site |
| TOS➣Tape Operating System (IBM) |
| TOS➣The Organic Standard (journal) |
| TOS➣Tip of the Spear |
| TOS➣Techniques, Ouvriers et de Service (French: Technical and Service Workers) |
| TOS➣Top of Steel |
| TOS➣Taken on Strength |
| TOS➣Traffic Operations System |
| TOS➣Top Of Slab (concrete) |
| TOS➣Transfer of Sovereignty (Baghdad, Iraq) |
| TOS➣Trucial Oman Scouts (Unite Arab Emirates) |
| TOS➣Time on Stream |
| TOS➣Tender of Service |
| TOS➣Tromso, Norway - Tromso/Langes (Airport Code) |
| TOS➣Total Outstanding Shares (Canada) |
| TOS➣Type Of Shipment |
| TOS➣Tennessee Orthopaedic Society |
| TOS➣Taux d'Onde Stationnaire (French: Standing Wave Ratio) |
| TOS➣Time Of Search |
| TOS➣Training Objective Statement |
| TOS➣Tunnels et Ouvrages Souterrains (French: Tunnels and Underground Structures; journal) |
| TOS➣Tactical Operations Squadron (USAF) |
| TOS➣Tactical Oceanographic Summary |
| TOS➣Teller Operations Specialist (banks) |
| TOS➣Terminal Oriented System |
| TOS➣Turbine Overspeed (aero engines) |
| TOS➣Tone Operated Squelch (two-way radio) |
| TOS➣Tactical Operator Station |
| TOS➣Terminal Oriented Software |
| TOS➣Testing Operations System |
| TOS➣Top of Shelf |
| TOS➣Track on Search |
| TOS➣Transition Operational State |
| TOS➣Transparent Optical Switch |
| TOS➣Transmission Optimization System |
| TOS➣TIROS (Television Infrared Observation Satellite) Operational Satellite (US NOAA) |
| TOS➣Take-Off-Structure (electric substation structure) |