| ATSS | Abbotsford Traditional Secondary School 
| Others |
| ATSS | Academic Technology Support Services
| Others |
| ATSS | Active Total Security Systems
| Others |
| ATSS | Administrative Technology Support Services
| Others |
| ATSS | Advanced Technical Staffing Solutions
| Others |
| ATSS | Analytic Technical Support Services
| Others |
| ATSS | Analytical and Technical Support Services
| Others |
| ATSS | ARH Technical Support System
| Others |
| ATSS | Arlington Tiered System of Support
| Others |
| ATSS | Association of Teachers of Social Studies
| Others |
| ATSS | Association of Traumatic Stress Specialists
| Others |
| ATSS | Automated Teacher Substitution System
| Others |
| ATSS | Automated Traffic Scenario Simulator
| Others |
| ATSS | Automatic Test Support System
| Others |
| ATSS | Automatic Transmission Speed Sensor
| Others |