- CERCA
- CFD販売
- Champion
- Charaful
- cheero
- cheero Energy Plus
- cheero Power Plus
- CHOETECH
- CHONCHOW
- CHORA
- CHORD
- Chrester
- Christian Dior
- Chromebase
- 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