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- Calcott Brothers - UK (defunct)
- Calfee Design - USA
- Caloi - Brazil
- Campion Cycle Company - UK
- Cannondale - USA
- Canyon bicycles - Germany
- Carrera bicycles - UK (produced by Merida Bikes)
- Catrike - USA (Recumbent)
- CCM - Canada
- Centurion - Japan
- Cervélo - Canada
- Chater-Lea - UK
- Chicago Bicycle Company - USA (defunct)
- CHUMBA - USA
- Cilo - Switzerland
- Cinelli - Italy
- Clark-Kent - USA (defunct)
- Claud Butler - UK
- Clément - France (defunct)
- Co-Motion Cycles - USA
- Coker - USA
- Colnago - Italy
- Columbia Bicycles - USA (defunct)
- Corima - France
- Cortina Cycles - USA
- Cube - Germany
- Currys - UK, no longer makes bicycles
- Cycleuropa Group - Sweden, manufactures such brands as: Gitane, Monark, Puch.
- Cycle Force Group - USA
- Cycles Devinci - Canada
- Cyfac - France
Read more about this topic: List Of Bicycle Brands And Manufacturing Companies