Donor
- C. Bruce Lee1 objects
- C. E. Purviance4 objects
- C. Gerald Clear6 objects
- California Archaeological Survey10 objects
- California Historical Society6 objects
- Carl Ortwin Sauer1 objects
- Caroline Mytinger4 objects
- Caroline Yacoe2 objects
- Charles Atwood Kofoid1 objects
- Charles Brockhoff15 objects
- Charles Henry Leavitt7 objects
- Charles Lewis Camp7 objects
- Charles M. Keller5 objects
- Charles Ostrander1 objects
- Charles Rossbach2 objects
- Clarence E. Smith1 objects
- Clement W. Meighan3 objects
- Conrad Bentzen3 objects
- Constance A. Meeks3 objects
- Constance Goddard DuBois2 objects