- Rationalism
- Ratisbonne, Louis Gustave Fortuné
- Ratitae
- Ratke, Wolfgang
- Ratlam
- Ratnagiri
- Ratnapura
- Raton
- Ratramnus
- Rattazzi, Urbano
- Rattlesnake
- Rau, Karl Heinrich
- Rauch, Christian Daniel
- Raucourt, Mlle
- Raudnitz
- Raumer, Friedrich Ludwig Georg von
- Raupach, Ernst Benjamin Salomo
- Ravaillac, François
- Ravaisson-Mollien, Jean Gaspard Félix
- Ravanastron
- Ravello
- Raven
- Raven-Hill, Leonard
- Ravenna
- Ravenna, Exarchate of
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- Ravensburg
- Ravenscroft, Edward
- Ravi
- Ravine
- Rawalpindi
- Rāwendis
- Rawitsch
- Rawlinson, George
- Rawlinson, Sir Henry Creswicke
- Rawlinson, Richard
- Rawlinson, Sir Robert
- Rawmarsh
- Rawtenstall
- Ray
- Ray, John
- Rayah
- Rayleigh, John William Strutt, 3rd Baron
- Raymond, Henry Jarvis
- Raymond of Sabunde
- Raymund of Antioch
- Raymund of Toulouse
- Raymund of Tripoli
- Raynal, Guillaume Thomas François
- Raynald of Châtillon
- Raynaud's Disease
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