- CiS electronic GmbH
- City of Berlin
- City of Bonn
- ClimatePartner GmbH
- Clinic & Job Dress GmbH
- CMS Legal Services EEIG
- COC AG
- Cofinpro AG
- Collective Leadership Institute e.V.
- comcut Messeservice GmbH
- cometis AG
- comforte AG
- Commerzbank AG
- Commha Consulting GmbH & CO KG
- COMPACTTEAM event-marketing-concept GmbH
- Company Information Company Rhenus SE & Co. KG
- Compleo Charging Solutions AG
- Compliance Solutions GmbH
- Computomics
- confern Mobeltransportbetriebe GmbH
- connect Neustadt GmbH & Co. KG
- Conrad Electronic SE
- Consultport GmbH
- Continental AG
- Control Risks
- Control Union Certifications Germany GmbH
- Core Technologies GmbH⠀
- Cornelsen Gruppe
- CPM Germany GmbH
- Cpro Industry Projects & Solutions GmbH
- CRCM Corporate Risk & Crisis Management GBR
- Croozer GmbH
- CropEnergies AG
- cubemos
- Cubes Holding GmbH (d&b Gruppe)
- Culligan Deutschland GmbH
- CWS-boco International GmbH
- cyber-Wear Heidelberg GmbH
- d.i.i. Deutsche Invest Immobilien AG
- d.i.i. Investment GmbH
- d&b audiotechnik GmbH & CO KG
- d&b solutions GmbH & Co KG
- Daimler AG
- Daimler Truck AG
- Damovo
- Dataforce Verlagsgesellschaft für Business Informationen mbH
- DAW SE
- DekaBank Deutsche Girozentrale
- DEKRA SE
- Delivery Hero SE
Deutsche Unterzeichner des UN Global Compact