Encyclopedias, Almanacs, Transcripts, and Maps
- Republic of the Sudan
- Republic of Venice
- Republic of Yemen
- Requests, Court of
- Reserve Associations
- Reserve Officer Training Corps
- Resistance, Theory of
- resolutions
- Resources of America and Great Britain Compared
- Restaurants
- Restoration, Portuguese War of (1640–1668)
- Retailing
- retainers
- Revels, Hiram
- Revivals and Revivalism
- Revolta da Chibata
- Revolution as Civil War: Patriot-Loyalist Conflict
- Revolution of 1905
- Revolution of 1905 (Russia)
- Revolution, Age of