| ATSC | Academic Technology Support Center 
| Others |
| ATSC | Accurate Tilt Servo Control
| Others |
| ATSC | Active Traction and Stability Control
| Others |
| ATSC | Adaptive Traffic Signal Control
| Others |
| ATSC | Administrative Technology Service Center
| Others |
| ATSC | Advanced Technology Studies Centre
| Others |
| ATSC | Advanced Television Standards Committee
| Others |
| ATSC | Advanced Television Systems Committee
| Others |
| ATSC | Advanced Televisions Systems Committee
| Others |
| ATSC | Advanced Total Soccer Coaching
| Others |
| ATSC | Advanced Tv Systems Committee
| Others |
| ATSC | Aerospace Technology Systems Corp
| Others |
| ATSC | Affiliated Tyreright Service Centre
| Others |
| ATSC | Air Traffic Security Coordinator
| Others |
| ATSC | Air Travellers Security Charge
| Others |
| ATSC | AlliedSignal Technical Services Corporation
| Others |
| ATSC | Alpha Team Space Command
| Others |
| ATSC | American Television Systems Committee
| Others |
| ATSC | American Traffic Signal Company
| Others |
| ATSC | Analog Television Systems Corporation
| Others |
| ATSC | Annihilate Terrestrial Service Completely
| Others |
| ATSC | Any Time Some Color
| Others |
| ATSC | Apparel Textile Sourcing Canada
| Others |
| ATSC | Arlington Travel Soccer Club
| Others |
| ATSC | Army Training Support Center
| Others |
| ATSC | Assessment And Treatment Services Center
| Others |
| ATSC | Athletic Training Service Center
| Others |
| ATSC | Atlantique Technique Soudage Coupage
| Others |
| ATSC | Autism Treatment Services Of Canada
| Others |
| ATSC | Aviation Electronics Technician (asw) Chief Petty Officer
| Others |