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- Clark, E. A., M.D1
- Cochran, Jerome, 1831-1896 author1
- Cochran, Jerome, 1831-1896, author1
- Coles, Walter, 1839-18921
- Columbia Hospital for Women and Lying-in Asylum (Washington, D.C.) author.1
- Columbia Pharmaceutical Association.1
- Combe, Andrew, 1797-18471
- Committee of Citizens of Boston Chosen to Raise a Morton Testimonial Fund, author.1
- Conklin, W. J. (William Judkins), 1844-19161
- Conklin, W. J. (William Judkins), 1844-1916, author1
- Cook, A. B. (Archie Brown), 1828- author1
- Cooper Union for the Advancement of Science and Art.1
- Coues, Elliott, 1842-18991
- Crane, J. T. (Jonathan Townley), 1819-1880, author1
- Crank, C. D.1
- Craven, Alfred Wingate, 1810-1879, author1
- Croes, J. J. R. (John James Robertson), 1834-1906 author1
- Crosby, Nathan, 1798-18851
- Curtis, Alva, 1797-1881, author1