Encyclopedias, Almanacs, Transcripts, and Maps
- Reform, Social
- Reformations in Eastern Europe: Protestant, Catholic, and Orthodox
- Reformers Take on Industry: The Progressive Era
- Refugees, Exiles, and Émigrés
- Refuseniks
- Reggae Aesthetics
- Reginald Martinez Jackson
- Regionalism and the Military
- Register House
- Regular Approaches
- Regular Establishment
- Regulation of Tobacco Products in the United States
- Regulators
- Regulators
- Reinhardt, Max (1873–1943)
- Reinhold Messner
- Reitern, Mikhail Khristoforovich
- Rej, Mikolaj
- Religion and the American Revolution
- Religion and the West