| Abbreviation | Definition |
|---|---|
| ART | Automatic Response Transmission |
| ARTBA | American Road and Transportation Builders Association |
| ARTCC | Air Route Traffic Control Centre |
| ARTIC | Anaheim Regional Transportation Intermodal Center |
| ARTIC | Articulated Bus |
| ARTIC | Articulated Lorry |
| ARTS | Activities Reservations Tracking System |
| ARTS | Advanced Rural Transportation System |
| ARTS | Advanced Rural Transportation Systems |
| ARTS | Automated Radar Terminal System |
| ARU | Australian Railways Union |
| ARV | Armored Reconnaissance Vehicle |
| ARV | Armoured recovery vehicle |
| ARZ | Auto-Restricted Zone |
| AS | Airline Schedule |
| AS | Anchor Star (Anchor-Based Street and Traffic Aware Routing) |
| AS | Auto and Shop Information |
| ASA | Air Service Area |
| ASA | Airline Services Agreement |
| ASA | Automotive Service Association |