Authors: d
- Robiou de La Tréhonnais, Félix Marie Louis Jean 1818-1894
- Robson-Scott, W. D. (William Douglas) 1903-1981
- Rocha Peixoto 1866-1909
- Rochefort, Henri 1831-1913
- Roche, Regina Maria -1845
- Rock, Charles 1866-1919
- Rock, Daniel 1799-1871
- Rockefeller, John D. (John Davison) 1839-1937
- Rockefeller, John D., Jr. (John Davison) 1874-1960
- Rodes, David Stuart -
- Rodríguez de Montalvo, Garci -
- Rodriguez, José Dolores -
- Rogers, Edmund Dawson 1823-1910
- Rogers, Grace McLeod 1865-1958
- Rojas, Fernando de -1541
- Roke, G. D. -
- Roland Holst-Van der Schalk, Henriette 1869-1952
- Rolle, Richard, of Hampole -1349
- Rolleston, Humphry Davy, Sir 1862-1944
- Romanes, Ethel Duncan -
- Romberg de Vaucorbeil, Maurice 1862-1943
- Romero de Terreros, Manuel, marqués de San Francisco 1880-1968
- Roosevelt, Eleanor 1884-1962
- Roosevelt, Franklin D. (Franklin Delano) 1882-1945
- Roper, Dora C. C. L. (Dora Cathrine Cristine Liebel) 1873-
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