- Chesnut, V. K. (Victor King), 1867-1938, compiler1
- Chew, Samuel, 1806-18631
- Chisolm, Julian John, 1830-19031
- Christy, Robert, active 1880, author1
- Citizens' Association of New York. Council of Hygiene and Public Health.1
- Clapp, A. (Asahel)1
- Clark, Henry G. (Henry Grafton), 1804?-18921
- Clark, John M. (John Morehead), 1821-1902, author1
- Cleveland, H. W. S. (Horace William Shaler), 1814-1900, author1
- Clymer, George, 1804-1881, author1
- Cochrane, John, 1813-18981
- Cogswell, William H. (William Henry), -18761
- Coleman, J., author1
- Collins, George L. (George Lewis), 1852-1926, author1
- Colorado Medical Library Association, author.1
- Committee of Revision and Publication of the Pharmacopœia of the United States of America (1890-1900), author.1
- Comstock, Dr., author1
- Coolidge, Richard H. (Richard Henry), 1816-1866 author1
- Cooper, Peter, 1791-1883, author1
- Corson, Eugene Rollin, 1855- author2