| Acronym | Definition |
|---|
| ATN | Attention (IEEE-488 / IEC-625 Interface Bus) |
| ATN | Africa Trade Network |
| ATN | Augmented Transition Network |
| ATN | Atlantic Tele-Network, Inc. (also seen as ATNI; Beverly, MA) |
| ATN | All Together Now (Beatles song) |
| ATN | Advanced Tiros N (satellite) |
| ATN | Amateur Television Network (FastScan) |
| ATN | Action Performance Companies, Inc. (stock symbol; Phoenix, AZ) |
| ATN | Account Telephone Number |
| ATN | Ausbildungs- und Tätigkeitsnachweis (German: training and activity proof, water emergency service) |
| ATN | Albinism, Tyrosinase-Negative |
| ATN | Agri-Food Trade Network (Canada) |
| ATN | Adaptive Tactical Navigation |
| ATN | assign thresholds (US DoD) |
| ATN | Acyclic Transmission Network |
| ATN | Accelerator Technical Note |
| ATN | Astrophysical Teletype Network |
| ATN | Application Technologies Nouvelles (French: Application for New Technologies; est. 1986) |
| ATN | AgTa1-xNbxO3 (Silver tantalate niobate; ferroelectric material) |
| ATN | Automatic Track Number (SYS-1) |
| ATN | Australian Television Network (Sydney, Australia) |
| ATN | Across the Nightmare (Dance Dance Revolution song) |
| ATN | Application Transport Network (computing) |
| ATN | Air Technology Network |
| ATN | Aeronautical Telecommunications Network |
| ATN | Acute Tubular Necrosis |
| ATN | Asian Television Network |
| ATN | Australasian Transport News |
| ATN | Arriva Trains Northern (UK train operator) |
| ATN | Advanced Television Infrared Observation Satellite |
| ATN | Acetonitrile |
| ATN | Air Traffic Network |
| ATN | Air Tahiti Nui |