Organisationen
- C&A
- CA
- CA Osasuna
- CAR-Center Automotive Research
- CAS
- CBC
- CBS
- CBS News
- CCC
- CCTV
- CDC
- CDU
- CDU-Präsidium
- CDU/CSU
- CDU/CSU-Bundestagsfraktion
- CERN
- CEZ
- CFR Cluj
- CFTC
- CHE
- CIA
- CMA
- CMC Markets
- CMS Hasche Sigle
- CNN
- CONI
- CRC
- CRM
- CRRC
- CS
- CSA
- CSC
- CSG
- CSI
- CSN
- CSU
- CT
- CTG
- CTS EVENTIM
- CTS Eventim
- CVC
- CVJM Rödinghausen
- Cagliari Calcio
- Calci
- Cale Copf Company
- Calgary Flames
- Callejon
- Calvin Klein
- Campbell Soup
- Canal Plus
- Canaly
- Canisius-Kolleg
- Canon
- Cap Anamur
- Capitol Theater
- Capri-Sonne
- Cardiff City
- Cargobull
- Caritas
- Caritas International
- Carl Hanser Verlag
- Carl Zeiss
- Carl Zeiss Jena
- Carlsen Verlag
- Carnival Cruise Lines
- Carolina Hurricanes
- Carolina Panthers
- Carrefour SA
- Carrera
- Cascada
- Cassidian
- Catania Calcio
- Cathay Pacific Airways
- Celesio
- Celta Vigo
- Celta de Vigo
- Celtic Glasgow
- Centers for Disease Control and Prevention
- Centrum für Hochschulentwicklung
- Cewe Color
- Challenge
- Champions League
- Chapecoense
- Charité
- Charles Schwab
- Charlotte Bobcats
- Charlotte Hornets
- Check24
- Chemnitzer FC
- Cheruskia