Similar to マー伯爵
 - CASL
 - CDix
 - CF-18 ホーネットMcDonnell Douglas CF-18 Hornet
 - CFL条件Courant–Friedrichs–Lewy condition
 - CH-53 (航空機)Sikorsky CH-53 Sea Stallion
 - ChapelChapel (programming language)
 - CherryPyCherryPy
 - CHOP療法CHOP (chemotherapy)
 - CIS 40 GLSTK 40 GL
 - Cisco Internetworking Operating SystemCisco IOS
 - CL-154級軽巡洋艦CL-154-class cruiser
 - CLIPSCLIPS
 - CLUCLU (programming language)
 - CMP FATCMP FAT
 - CMPトラックCanadian Military Pattern truck
 - CODASYLCODASYL
 - Code ReadingCode Reading
 - Common LispCommon Lisp
 - Common Object Request Broker ArchitectureCommon Object Request Broker Architecture
 - Common Warehouse MetamodelCommon warehouse metamodel
 - Common Lisp Object SystemCommon Lisp Object System
 - Communicating Sequential ProcessesCommunicating sequential processes
 - Comprised ofComprised of
 - Computer ModernComputer Modern
 - Computer-generated imageryComputer-generated imagery
- Concrete MathematicsConcrete Mathematics
 - Concurrent Prolog
 - Corel Paint Shop ProPaintShop Pro