Authors: We Johns
- Ridpath, John Clark 1840-1900
- Rieger, J. B. (John Benjamin) 1886-
- Rigaud, J. F. (John Francis) 1742-1810
- Riley, James Whitcomb 1849-1916
- Ritchie, John W. (John Woodside) 1871-1943
- Robb, John S. -1856
- Roberts, John -
- Robertson, J. M. (John Mackinnon) 1856-1933
- Robertson Scott, J. W. (John William) 1866-1962
- Robinson, John 1846-1925
- Robinson, John H. (John Henry) 1863-1935
- Robison, John 1739-1805
- Roby, John 1793-1850
- Rochester, John Wilmot, Earl of, 1647-1680
- Rockefeller, John D. (John Davison) 1839-1937
- Rockefeller, John D., Jr. (John Davison) 1874-1960
- Rockey, J. W. (John Wesley) 1909-
- Rodwell, J. M. (John Medows) 1808-1900
- Rogers, John Godfrey, Sir 1850-
- Romanes, George John 1848-1894
- Romero, John Bruno -
- Ronge, Johannes 1813-1887
- Roper, John Charles 1858-1940
- Ropes, John Codman 1836-1899
- Rose, J. Holland (John Holland) 1855-1942
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