- Clark, Henry G. (Henry Grafton), 1804?-1892, author1
- Clement, Richard, active 1869, author1
- Clinico-Pathological Society of Washington, D.C.1
- Cochran, James, (Physician), author1
- Codman & Shurtleff.1
- Coles, Walter, 1839-1892 author1
- Columbia College (New York, N.Y.), author.1
- Cremer, Albert, author11
- Cunha, Raymundo Caetano da.1
- Damon, Howard Franklin, 1833-18841
- Darjou, Alfred-Henri, 1832-1874, artist1
- Davis, Andrew Jackson, 1826-19101
- Dayfoot, Herbert M., author1
- De Gersdorff, B., author1
- Draper, Henry, 1837-18821
- Duffield, Samuel P., author1
- Duncan, J. Matthews (James Matthews), 1826-18902
- Dunlap, Alex. (Alexander), 1815-1900?, author1
- Dyer, David.1
- Eagon, Samson, 1835-1915, author1