- Charles A. Derby papers, 1839/18911
- Charles E. S. Haas Notebook, 1848/18491
- Charles F. Bryan, Jr. papers, 1958/20021
- Charles H. Bell Papers, 1772/1929, bulk 1852/18751
- Charles J. Hansrote, Jr. collection, 1950/19521
- Charles L. Kendrick III papers, 1977/19951
- Charles P. Deyerle papers, 1842/18553
- Charles Wingfield Hamner Arithmetic Notebook, 1798/18411
- Christopher Bram Papers, 1968/2014, bulk 1975/20001
- Christopher Bright notebooks, 1990/19911
- Christopher J. Bright Notebooks, 1984/19871
- Collection of W. W. Yen materials, 1899/19741
- Committee on Degrees Records, 1955/19771
- Copp's Schoolhouse Notebook and Ledger, 1867/19081
- Daily Physician's Pocket Record Notebook, 1877/18781