| Abbreviation | Definition |
|---|---|
| CIS | Chinese International Shipping |
| CIS | Cockpit Instrumentation System |
| CIS | Constant Idle System |
| CIT | Certifications In Transit |
| CITA | Canadian Industrial Transportation Association |
| CITAT | Container Inspection Training and Assistance Team |
| CITE | Connected Intelligent Transportation Environment |
| CITM | Centre for Integrated Transportation and Mobility |
| CITS | Center for Innovative Transportation Solutions |
| CITT | Center for International Trade and Transportation |
| CITT | Citizens Independent Transportation Trust |
| CITT | Citizen's Independent Transportation Trust |
| CITT | Citizens' Independent Transportation Trust |
| CJ | Captain's Journal |
| CJ | Chevy Jeep |
| CJ | Circle Jerk |
| CJ | Civilian Jeep |
| CJTS | Comparative Journey Times Survey |
| CK | Car Kit |
| CKD | Cycling Ketogenic Diet |