| Abbreviation | Definition |
|---|---|
| COGSA | Carriage of Goods By Sea Act |
| COHMED | Cooperative Hazardous Materials Enforcement Development Program |
| COIF | Certificate of Initial Fitness (UK) |
| COL | Container Off Load |
| COLREGS | Collision Regulations |
| COMET | Commercial Experiment Transporter |
| COMPASS | COMPuter ASSurance Conference |
| CONRAIL | Consolidated Rail Corporation |
| CONUS | Continental/Contiguous/Conterminous United States |
| COOPG | Cooperage |
| COP | Child Occupant Protection |
| CORE | Commercial Operators Rate Equity |
| CORE | Craving Off Road Excitement |
| CORN | Computer Resources Nucleus |
| COS | City of Colorado Springs Municipal Airport |
| COTA | Central Ohio Transit Authority |
| COTA | Chinese Overseas Transportation Association |
| COTS | Commercial Off The Shelf |
| COTS | crude oil transportation system |
| COW | Cellular On Wheels |