Institution
- Chiron (Firm)1
- Chrysler Corporation1
- Chrysler Institute1
- Chuck Elkins & Associates1
- Ciba Pharmaceutical Company1
- Cirrus Diagnostics (formerly Pegasus Technologies) 1
- Clare College (University of Cambridge)1
- Cleary, Gottlieb, Steen & Hamilton1
- Coal Mining Research Centre1
- Coates and Welter Instrument Corporation1
- Collaborative Research, Inc.1
- College of Environmental Science and Forestry1
- College of Physicians and Surgeons of Chicago1
- College of William & Mary1
- College of Wooster1
- College of the Holy Cross (Worcester, Mass.)1
- Collège de France1
- Colorado College1
- Columbia Plastic Products Manufacturing Company1
- Columbia University. School of Law1