| ATN | Account Telephone Number 
| Others |
| ATN | Across The Nation
| Others |
| ATN | Activity Type Name
| Others |
| ATN | Acute tubular necrosis
| Others |
| ATN | Administrative Tracking Number
| Others |
| ATN | Adolescent Trials Network
| Others |
| ATN | Advanced Toxicology Network
| Others |
| ATN | Advanced TV Network
| Others |
| ATN | Aeronautical Telecommunication Network
| Others |
| ATN | Aeronautical Telecommunications Network
| Others |
| ATN | Africa Trade Network
| Others |
| ATN | Air Transport News
| Others |
| ATN | Alabama & Tennessee River Railway
| Others |
| ATN | Alabama Technology Network
| Others |
| ATN | All Through The Night
| Others |
| ATN | All Together Now
| Others |
| ATN | All Transport Needs
| Others |
| ATN | Amateur Television Network
| Others |
| ATN | American Technologies Network
| Others |
| ATN | Animal Telemetry Network
| Others |
| ATN | Anishanabe Tribal Nation
| Others |
| ATN | Another Turd Not Needed
| Others |
| ATN | Army Training Network
| Others |
| ATN | Around the NFL
| Others |
| ATN | Assign Threshold Negative
| Others |
| ATN | Associated Transaction Network
| Others |
| ATN | Atlantic Tele Network
| Others |
| ATN | Attachment and Trauma Network
| Others |
| ATN | Attachment Trauma Network
| Others |
| ATN | Augmented Transition Network
| Others |
| ATN | Australian Technology Network
| Others |
| ATN | Autism Treatment Network
| Others |
| ATN | Auto Times News
| Others |
| ATN | Automated Transit Networks
| Others |
| ATN | Automotive Technician Network
| Others |
| ATN | Automotive Television Network
| Others |
| ATN | Automotive Training Network
| Others |
| ATN | Namatanai, Papua New Guinea
| Others |
| ATN | The Aviation Training Network
| Others |