Encyclopedias, Almanacs, Transcripts, and Maps
- Rosso di San Secondo, Piermaria
- Rostenkowski, Dan
- Rostopchin, Feodor Vasilyevich, Count
- Rostow, Eugene Victor Debs
- rotation of crops
- rotenone
- Roth, Alvin Elliot
- Roth, Cecil
- Roth, Frederick George Richard
- Roth, Joseph
- Rothamsted
- Rothenburg ob der Tauber
- Rothesay, David Stuart, duke of
- Rothman, James Edward
- Rothschild, Nathan Meyer
- Rothstein, Arnold
- Roty, Louis Oscar
- Rouergue
- Rougé, Emmanuel, vicomte de
- Rougemont, Denis de