| Acronym | Meaning |
 | CI | Crew Interface |
| CIA | Control Interface Assembly |
| CIA | Controller Interface Assembly |
| CIAP | Climatic Impact Assessment Program |
| CIB | Change Impact Board |
| CIB | Change Implementation Board |
| CIC | Command Interface Control |
| CIC | Control And Information Center |
| CICC | Cargo Integration Control Center |
| CICU | Communication Interface Control Unit |
| CICU | Computer Interface Conditioning Unit |
| CICU | Computer Interface Control Unit |
| CID | Computer Interface Device |
| CIDL | Configuration Item Data List |
| CIDR | Critical Intermediate Design Review |
| CIE | Communications Interface Equipment |
| CIF | Central Instrumentation Facility |
| CIG | Cable Integrity Group |
| CIG | Communications And Interface Group |
| CIL | Critical Items List |
| CIM | Computer Input Multiplexer |
| CIN | Change Identification Number |
| CIR | Cargo Integration Review |
| CIR | Circle |
| CIR | Circulate |
| CIR | Configuration Inspection Report |
| CIRC | Circularization Burn |
| CIRCUM | Circumference |
| CIRHS | Critical Items And Residual Hazards List |
| CIS | Central Integration Site |
| CIS | Change Impact Summary |
| CIS | Communication Interface System |
| CIS | Communications Interface System |
| CIS | Component Identification Sheet |
| CIS | Contractor's Information Submittal |
| CISS | Centaur Integrated Support Structure |
| CIT | Critical Item Tag |
| CITE | Cargo Integration Test Equipment |
| CITE | Cargo Integration Test Equipment |
| CIU | Communication Interface Unit |
| CIU | Computer Interface Unit |
| CIU | Controller Interface Unit |
| CIVT | Cargo Interface Verification Test |
| CK | Check |
| CKAFS | Cape Kennedy Air Force Station (Changed To CCAFS) |
| CKPT | Checkpoint |
| CKRA | Cape Kennedy Reference Atmosphere (Changed To CCR |
| CKS | Checks |
| CKT | Circuit |
| CL | Centerline |
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