Encyclopedias, Almanacs, Transcripts, and Maps
- Rodríguez, Martín
- Roehm, Ernst
- Roemer, Olaus
- Roentgen ray
- roentgenium
- Roermond
- Roeselare
- Rogaland
- Roger I
- Roger of Hoveden
- Roger Williams National Memorial
- Rogers, Adrian Pierce
- Rogers, Henry Huttleston
- Rogers, James Harvey
- Rogers, Richard, Baron Rogers of Riverside
- Rogers, William Barton
- Rogge, Jacques
- Rogovin, Milton
- Roh Moo Hyun
- Rohan, Louis René Édouard, prince de