- Convotherm
- Cooke & Lewis
- Cooper Lighting
- Corel
- Corsair
- Cortex
- Cowon
- Coyote
- Creative
- Crem Coffee
- Cressi
- Crest Audio
- Crosscall
- Crown
- CTEK
- Cub Cadet
- Cuisinart
- Curtis
- Curtiss
- CUSTOM
- CyberLink
- CyberPower
- Cybex International
- Cyrus
- D-JIX
- D-Link
- Dacia
- DAELIM
- Daewoo
- Daikin
- Daitsu
- DANE-ELEC
- danew
- Danfoss
- DAP Audio
- Dassault Systèmes
- Datapath
- DAVIS
- Daxten
- dbx