| Acronym | Definition |
|---|
| TAO | Together as One |
| TAO | Track-At-Once (CD creation) |
| TAO | Tailored Access Operations (US NSA) |
| TAO | Track at Once |
| TAO | The Ancient Order (gaming clan) |
| TAO | The Ardennes Offensive (war) |
| TAO | Tropical Atmosphere Ocean |
| TAO | Tactics Arena Online (gaming) |
| TAO | Traduction Assistée Par Ordinateur (French: computer-assisted translation) |
| TAO | The ACE ORB (Object Computing, Inc.) |
| TAO | Thromboangiitis Obliterans |
| TAO | The Autumn Offering (band) |
| TAO | Telecommunications Advancement Organization of Japan |
| TAO | Topical Antibiotic Ointment |
| TAO | Technical Assistance Organization (various organizations) |
| TAO | Traducción Asistida por Ordenador (Spanish: Computer-Assisted Translation) |
| TAO | Transfer of Authority |
| TAO | Triple Antibiotic Ointment |
| TAO | The Alphabetical Order (Washington, DC rock band) |
| TAO | Toolkit for Advanced Optimization |
| TAO | Tambon Administrative Organization (Thailand) |
| TAO | Taxpayer Assistance Order |
| TAO | Tactical Air Operations |
| TAO | The Aikido Ohana (martial arts; Japan) |
| TAO | Tactical Coordinator |
| TAO | Technology Applications Office |
| TAO | Tokyo Astronomical Observatory |
| TAO | Transition Assistance Office |
| TAO | Totally Automated Office |
| TAO | Tactical Actions Officer |
| TAO | Travel Agents Ordinance |
| TAO | Taiwanese American Organization (various locations) |
| TAO | Ten Acre Observatory (Oklahoma) |
| TAO | Tactical Area of Operations (various armed forces; also seen as TAOR) |
| TAO | Telephony Application Object (CORBA) |
| TAO | Thème Apprentissage et Optimisation (French: Theme Learning and Optimization) |
| TAO | TSCA Assistance Office (US EPA) |
| TAO | Tin-Antimony Oxide |
| TAO | Transformation Alignment Office (Canada) |
| TAO | Technical Assistance Operations |
| TAO | Technical Applications Office |
| TAO | TOGA Atmosphere Ocean |
| TAO | TACAN Only |
| TAO | Technical Assistance Order |
| TAO | Technical Arrest Order |
| TAO | Time and Altitude Over ... (location) |
| TAO | Terrain Avoidance Override |
| TAO | TOGA Automated Observations |
| TAO | Temporary Area Office |
| TAO | Fleet Oiler - MSC Manned (also abbreviated T-AO) |
| TAO | Task Area Objective |
| TAO | Transportation Applications Office |
| TAO | Tactical Air Observer/Observation |
| TAO | Test Analysis Outline |
| TAO | Tactical Air/Action Officer |
| TAO | Tactical Aeronautical Order |
| TAO | Total Advanced Optimization |
| TAO | Test Assisté Par Ordinateur (French: Computer-Assisted Test) |