Authors: H.
- Roberts, Randal H. (Randal Howland), Sir 1837-1899
- Robinson, Charles H. (Charles Henry) 1861-1925
- Robinson, C. H. (Charles Henry) 1843-
- Robinson, Eliot H. (Eliot Harlow) 1884-
- Robinson, Harriet Jane Hanson 1825-1911
- Robinson, Harry Perry 1859-1930
- Robinson, H. P. (Henry Peach) 1830-1901
- Robinson, James Harvey 1863-1936
- Robinson, John H. (John Henry) 1863-1935
- Robinson, T. H. (Thomas Heath) 1869-1954
- Roechling, H. Alfred -
- Roelfsema, H. R. -
- Rogers, W. H. Hamilton (William Henry Hamilton) 1828-1913
- Röhl, Hermann 1851-1923
- Rohrer, Robert H. 1946-
- Rolleston, Humphry Davy, Sir 1862-1944
- Ronner, Henriette 1821-1909
- Roots, Logan H. (Logan Holt) 1841-1893
- Rosa, H. -
- Rosedale, H. G. (Honyel Gough) 1863-1928
- Rosenbaum, Henry W. -
- Rosenthal, Herman 1843-1917
- Rosny, J.-H., aîné 1856-1940
- Rosny, J.-H., jeune 1859-1948
- Ross, Charles H. (Charles Henry) -1897
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