Encyclopedias, Almanacs, Transcripts, and Maps
- rat snake
- Ratak Chain
- Ratdolt, Erhard
- ratfish
- Ratibor
- Ratisbon
- Ratlam
- Ratmansky, Alexei
- Rattazzi, Urbano
- rattlesnake weed
- Rauma
- Ravalomanana, Marc
- Ravensberg
- Ravensburg
- Rawdon-Hastings, Francis
- Rawlinson, George
- Rawlinson, Henry Seymour Rawlinson, 1st Baron
- Rawlinson, Sir Henry Creswicke
- Rayleigh, John William Strutt, 3d Baron
- Raymond Berengar IV