| Acronym | Definition |
|---|
| TMO | Thermo Fisher Scientific (various locations) |
| TMO | T-Mobile |
| TMO | The Mac Observer (website) |
| TMO | Timeout (Hekimian) |
| TMO | Technologies Management Office |
| TMO | Transformation Management Office |
| TMO | Toprak Mahsulleri Ofisi (Soil Products Office of Turkey) |
| TMO | Tenant Management Organisation (UK) |
| TMO | Traffic Management Office |
| TMO | Television Match Official (rugby) |
| TMO | Transition Management Office (various organizations) |
| TMO | True Mechanical Override (flush operation) |
| TMO | Transportation Management Office |
| TMO | Take Me Out |
| TMO | Traffic Management Officer |
| TMO | The Matrix Online (game) |
| TMO | That's My Opinion |
| TMO | Tracking of Moving Objects (navigation) |
| TMO | Table Mountain Observatory |
| TMO | The Metal Observer (website) |
| TMO | Travel Management Online (software) |
| TMO | Technology Management Office |
| TMO | Trunked Mode Operation |
| TMO | Thermophilic Microorganism (biotechnology) |
| TMO | Telegraphic Money Order |
| TMO | Tokimeki Memorial Online (gaming) |
| TMO | Too Many Options |
| TMO | Telephone Money Order |
| TMO | Trans-Metro Optical (Cyras Systems) |
| TMO | Total Mad Ownage |
| TMO | Transportation Movements Office(r) |
| TMO | Troubles Moteurs de l'Oesophage (French: esophageal motor disorders) |
| TMO | Thermo Magnetic Optical (media) |
| TMO | Transaction Management Object (multi-user environments) |
| TMO | Ten Miles Out (aviation) |
| TMO | Trials Management Organization |
| TMO | Text Messaging Operations |
| TMO | Tactical Management Office |
| TMO | Talent Management Organization |
| TMO | The McCallum Observer |
| TMO | Total Materiel Objective |