- chuclla
- CHUWI
- Ci：z.Labo
- CICADA
- CICIBELLA
- CICONIA
- CineBeam
- CINEMAGE
- CineStill Film
- Cintiq Pro
- CIO
- CIRCULATION
- Cisco
- CKファクトリー
- Classic（TOYOTOMI）
- CLATHAS
- CLEA
- clear
- CLEAR Arch
- Clear Tune Monitors
- CLEARLABO
- Clearly Superior Technologies
- Cleary
- CLEAVE（Deff）
- CLEDRAN
- Cleer
- CLEVO
- Click Car Products CLICK CAR MOUSE
- CLIE
- CLINIQUE
- CLuaR
- Co-Goods
- COBRA（ゴルフ）
- COBY
- cocopar
- COCOROMAKE
- COCOSILK
- Cocotte（NATURAL design）
- CODE
- COEL