| Acronym | Definition |
|---|
| ATO➣Australian Taxation Office |
| ATO➣Alpha Tau Omega |
| ATO➣Air Traffic Organization (FAA) |
| ATO➣Atco (Amtrak station code; Atco, NJ) |
| ATO➣Arsenic Trioxide (chemotherapy) |
| ATO➣Authorization to Operate |
| ATO➣Anti-Terrorist Operation (Ukraine) |
| ATO➣Arab Towns Organization |
| ATO➣Ambito Territoriale Ottimale (Italy) |
| ATO➣Assemble To Order |
| ATO➣Authority to Operate |
| ATO➣Accredited Training Organisation |
| ATO➣Approved Training Organization |
| ATO➣Air Tasking Order |
| ATO➣Antimony Tin Oxide |
| ATO➣Aviation Training Organization (various organizations) |
| ATO➣Atmos Energy Corporation (stock symbol) |
| ATO➣Automatic Top Off System (water level controller) |
| ATO➣Automatic Train Operation (for rail signaling systems) |
| ATO➣Abort To Orbit (Shuttle) |
| ATO➣Air Transportation Office (Philippines) |
| ATO➣Advanced Technology Office (US DARPA) |
| ATO➣Approval to Operate |
| ATO➣Agency Tender Official (US Army) |
| ATO➣Athens Ohio (airport code) |
| ATO➣Air Traffic Operations |
| ATO➣Army Technology Objective (formerly Science and Technology Objective) |
| ATO➣Aborted Take-Off (aviation) |
| ATO➣Antimony Trioxide |
| ATO➣Asset Turnover |
| ATO➣Ammunition Technical Officer |
| ATO➣Anti-Terrorism Officer |
| ATO➣All Things Organic |
| ATO➣Ankara Ticaret Odasi |
| ATO➣After the Order (band) |
| ATO➣Austria Ticket Online |
| ATO➣Alternative Trading Organization (fair trade organization) |
| ATO➣African Timber Organisation |
| ATO➣Afloat Training Organization |
| ATO➣Authorization to Offer |
| ATO➣Administrative Time Off |
| ATO➣Assisted Takeoff |
| ATO➣Airport Ticket Office |
| ATO➣Area Training Officer |
| ATO➣Airborne Tactical Officer |
| ATO➣Actual Time Over |
| ATO➣Automatic Take Off (dairy industry) |
| ATO➣After a Time Out (sports) |
| ATO➣Ankara Tabip Odasi |
| ATO➣At Time of Order (purchasing) |
| ATO➣Account Take Over |
| ATO➣Assist the Officer Foundation (Dallas, Texas USA) |
| ATO➣Automatic Turn-On |
| ATO➣Alternative Treatment Order |
| ATO➣Aircraft Transfer Order |
| ATO➣Authorized Time Off |
| ATO➣Antarctic Terminal Operations |
| ATO➣Area of Tactical Operations |
| ATO➣Air Tasking Officer |
| ATO➣Afghanistan Theater of Operations |
| ATO➣Administrative and Training Officer (Office of Emergency Preparedness) |
| ATO➣Achilles Tendon Operation |
| ATO➣Address (Complete) Time Out (Telcordia) |
| ATO➣Analog Tandem Office |
| ATO➣Anti-Tyranny Organization |
| ATO➣Aviation Transportation Officer |
| ATO➣ATCCS Test Office |
| ATO➣Atmosphere Over Pressure |
| ATO➣Advanced Technology Offerings (OSF) |
| ATO➣Authorized Task Order |
| ATO➣Advisory Title Officer |