Names
- Colt, Harris Dunscomb, 1861-1959.1
- Comstock, William Alfred, 1877-1949.1
- Conference on Near Eastern Affairs (1922-1923 : Lausanne, Switzerland)1
- Cooley, Mortimer E. (Mortimer Elwyn), 1855-1944.1
- Cooley, Thomas McIntyre, 1824-1898.1
- Cope, E. D. (Edward Drinker), 1840-1897.1
- Copeland, Royal S. (Royal Samuel), 1868-1938.1
- Couzens, James, 1872-1936.1
- Crisler, H. O. (Herbert Orin), 1899-1982.1
- Cumerian Club1
- Cummings, Joseph, 1817-1890.1
- Currier, A. O.1
- Dana, James Dwight, 1813-1895.1
- Darwin1
- Davison, Archibald T. (Archibald Thompson), 1883-1961.1
- De Forest, Robert W. (Robert Weeks), 1848-1931.1
- Dean, Henry Stewart, 1830-1915.1
- Denby, Edwin, 1870-1929.1
- Dickinson, Luren Dudley, 1859-1943.1
- Dolbear, A. E. (Amos Emerson), 1837-1910.1