Encyclopedias, Almanacs, Transcripts, and Maps
- Ruthven Castle
- Rutledge, Ann
- Rutledge, Edward
- Rütli
- Rutskoi, Aleksandr Vladimirovich
- Rutte, Mark
- Ruvuma
- Ruysbroeck, John
- Ruysdael, Jacob van
- Ruži?ka, Leopold Stephen
- Ryan, Kay
- Ryan, Paul Davis
- Rybinsk Reservoir
- Rydberg constant
- Rydberg, Abraham Viktor
- Ryerson, Egerton
- Rykov, Aleksey Ivanovich
- Ryks Museum
- Ryle, Sir Martin
- Rzhev