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- Cohen, J. Solis (Jacob Solis), 1838-19273
- Cohen, J. Solis (Jacob Solis), 1838-1927, author1
- College of Physicians of Philadelphia, author.1
- Connecticut. Bureau of Vital Statistics, author.1
- Connor, Leartus, 1843-1911, author1
- Cook, George Wythe, 1846-1928, author1
- Cook, W. C. (William Cowden), 1840- author1
- Cooper, Hunter P. (Hunter Pope), 1860-1906 author1
- Cope, E. D. (Edward Drinker), 1840-1897, author1
- Corson, Eugene Rollin, 1855- author1
- Corson, Hiram, 1804-1896 author1
- Cotting, Benjamin Eddy, 1812-1897, author1
- Cotton, John C., 1828-1915, author1
- Coues, Elliott, 1842-1899 author1
- Cowl, Walter Y., author1
- Cowles, Edward, 1837-19191
- Cowperthwaite, A. C. (Allen Corson), 1848-19261
- Culin, Stewart, 1858-1929, author2
- Currier, Andrew F. (Andrew Fay), 1851-1937, author1