Similar to コネクションレス型通信
 - Compression Attached Memory ModuleCAMM (memory module)
 - CompuServeCompuServe
 - Computer Based TestingElectronic assessment
 - Computer Typesetting System
 - COMPUTEX TAIPEIComputex
 - Conary
 - Concurrency and Coordination RuntimeConcurrency and Coordination Runtime
 - Construction Master
- Continue文Continue (keyword)
 - Cooper LakeマイクロアーキテクチャCooper Lake (microprocessor)
 - CoplandCopland (operating system)
 - Core Audio (Windows)
 - Core DataCore Data
 - Core ImageCore Image
 - Core TextCore Text
 - CoreマイクロアーキテクチャIntel Core (microarchitecture)
- Courier-MTACourier Mail Server
 - CowsayCowsay
 - CPANCPAN
 - CPUソケットCPU socket
 - CPU年表
 - Cray T3DCray T3D
 - Cray XD1Cray XD1
 - Cray Y-MPCray Y-MP
 - CrossFireXAMD CrossFire
 - CRTC (LSI)
 - CTANCTAN
 - CUPSCUPS