| Abbreviation | Definition |
|---|---|
| CASTWG | Converging Approach Standards Technical Working Group |
| CAT | Capital Area Transit |
| CAT | CATalytic converter |
| CAT | Catamaran And Tri-hull |
| CAT | Central Area Transit |
| CAT | Central Arkansas Transit |
| CAT | Charlottesville Area Transit |
| CAT | Civil Air Transport |
| CAT | Classical All Terrain |
| CAT | Clear-Air Turbulence |
| CAT | Continually Always Towed |
| CATA | Cape Ann Transportation Authority |
| CATA | Centre Area Transportation Authority |
| CATC | Capital Area Transportation Coalition |
| CATC | Casper Area Transportation Coalition |
| CATD | Computer Aided Train Dispatching |
| CATP | context aware transportation protocol |
| CATS | Capital Area Transit System |
| CATS | Chicago Area Transportation Study |
| CATS | Computer-Aided Transport System |