Encyclopedias, Almanacs, Transcripts, and Maps
- Rostow, Walter Whitman ("Walt")
- Rostow, Walter Whitman (“Walt”)
- Roszak, Theodore
- Rote, Kyle, Jr.
- Roth, Henry
- Roth, Philip Milton
- Roth, William Victor, Jr.
- Rotinese
- Roto
- Rotuma
- Rougier, Louis (1889–1982)
- Roumain, Jacques (1907–1944)
- Rous, (Francis) Peyton
- Rouse, James Wilson
- Rousseau, Jean-Jacques (1712–1778)
- Roy, Eugène (?–1939)
- Royal Dutch Shell
- Royce, Josiah (1855–1916)
- Rozanov, Vasilii Vasil'evich (1856–1919)
- Rozelle, Alvin Ray ("Pete")