Organisationen
- C&A
- CA
- CA Osasuna
- CAS
- CBC
- CBS
- CCC
- CCTV
- CDC
- CDU
- CDU-Präsidium
- CDU/CSU
- CDU/CSU-Bundestagsfraktion
- CERN
- CHE
- CIA
- CMA
- CMC Markets
- CNN
- CRC
- CRM
- CRRC
- CS
- CSA
- CSC
- CSG
- CSI
- CSU
- CT
- CTG
- CTS EVENTIM
- CTS Eventim
- CVJM Rödinghausen
- Cagliari Calcio
- Calci
- Cale Copf Company
- Calgary Flames
- Callejon
- Calvin Klein
- Campbell Soup
- Canal Plus
- Canaly
- Canisius-Kolleg
- Canon
- Cap Anamur
- Cardiff City
- Cargobull
- Caritas
- Caritas International
- Carl Zeiss
- Carl Zeiss Jena
- Carlsen Verlag
- Carolina Hurricanes
- Carolina Panthers
- Carrera
- Cascada
- Ceconomy
- Celta Vigo
- Celta de Vigo
- Celtic Glasgow
- Centrum für Hochschulentwicklung
- Cewe Color
- Champions League
- Chapecoense
- Charité
- Charles Schwab
- Charlotte Hornets
- Check24
- Chemnitzer FC
- Cheruskia
- Chevrolet
- Chevrolet Corvette
- Chevron
- Chicago Bears
- Chicago Blackhawks
- Chicago Bulls
- Chicago Cubs
- Chicago Symphony Orchestra
- China Daily
- Chiron-Werke
- Christian Dior S.A.
- Christie's
- Christliche Initiative Romero
- Christoffel-Blindenmission
- Chrysler LLC
- Cincinnati Bengals
- Cinven Group
- Circus Krone
- Cirrus Airlines
- Cisco Systems