- Rupert, Prince
- Rupert's Land
- Rurik
- Rush, Benjamin
- Ruskin, John
- Russell, John
- Russell of Killowen, Charles
- Russell, William
- Russell, William Clark
- Russia, Empire of
- Russian Hymn
- Russo-Japanese War
- Rust
- Rust (in plants)
- Ruth
- Rutland, Vt.
- Ruwenzori
- Ruysdael, Jakob
- Ruyter, Michael Adrianszoon de
- Rye
- Rye-House Plot
- Ryerson, Adolphus
- Ryswick, Peace of
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