- California. Commissioner in Lunacy.1
- Carpenter, William Benjamin, 1813-1885, author1
- Carroll, Alfred Ludlow, 1833-18931
- Carson, Joseph, 1808-1876, author1
- Chadwick, James R. (James Read), 1844-1905, author1
- Charles, T. Edmondston (Thomas Edmondston), author1
- Charter, William R., author1
- Chase, A. W. (Alvin Wood), 1817-18851
- Chew, Samuel Claggett, 1837-1915, author1
- Child, Duff, author1
- Clapp, Otis.1
- Coffin, Amory, 1813-1884, author1
- Colburn, G. F. J. (George F. J.), author1
- Colvin, Verplanck, 1847-1920, author1
- Combe, Andrew, 1797-18471
- Cope, E. D. (Edward Drinker), 1840-1897, author1
- Cornell University, author.1
- Corson, Hiram, 1804-18961
- Coskery, Oscar J., 1843-18891
- Crothers, T. D. (Thomas Davison), 1842-1918, author1