Authors: R.
- Clark, Marvin R. 1840-
- Clausius, R. (Rudolf) 1822-1888
- Clephan, R. Coltman (Robert Coltman) 1839-1922
- Clifford, C. R. (Chandler Robbins) 1858-1935
- Clifton, Grace R. -
- Cobbold, Richard 1797-1877
- Cobb, Ruth 1878-1950
- Cockerell, C. R. (Charles Robert) 1788-1863
- Coe, Wesley R. (Wesley Roswell) 1869-1960
- Cohen, Morris R. (Morris Raphael) 1880-1947
- Cohen, Reuben 1895-1981
- Coker, R. E. (Robert Ervin) 1876-1967
- Coleman-Norton, Paul R. (Paul Robinson) 1898-1971
- Coleridge, Christabel R. (Christabel Rose) 1843-1921
- Cole, Thomas R. (Thomas Raymond) 1881-1970
- Collingwood, R. G. (Robin George) 1889-1943
- Commons, John R. (John Rogers) 1862-1945
- Conder, C. R. (Claude Reignier) 1848-1910
- Connolly, R. Hugh (Richard Hugh) 1873-1948
- Conrad, Robert Taylor 1810-1858
- Conway, G. R. G. (George Robert Graham) 1873-1951
- Cook, John R. 1844-1917
- Cooper, David R. -
- Cooper, Isabel 1892-1984
- Coppinger, R. W. (Richard William) 1847-1910
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