Encyclopedias, Almanacs, Transcripts, and Maps
- Redlich, Frederick C.
- Redlich, Hans Ferdinand
- Redlich, Joseph
- Redlich, Norman
- Redon, Abbey of
- Redstone, Sumner Murray
- Reductions of Paraguay
- Rée, Hartvig Philip
- Reese, Jimmie
- Reese, Michael
- Reeve, Ada
- Refah Partisi
- Reflex Principles
- Reform: Arab Middle East and North Africa
- Reform: Iran
- Reform: Muslim Communities of the Russian Empire
- Reform: South Asia
- Reform: Southeast Asia
- Reformation
- Reformation, Protestant (in the British Isles)