- Pueblo Indians
- Providence (county)
- Providence (city)
- Râle, Sébastien
- Raleigh (county)
- Raleigh (city)
- Raleigh, Walter
- Ralls
- Ralph, James
- Ram, Battering
- Ram, Water
- Ramadan, or Ramazan
- Ramayana
- Rambouillet
- Rambouillet, Catherine de Vivonne
- Rameau, Jean Philippe
- Rameses, or Ramses
- Ramie
- Ramillies, or Ramilies
- Ramisseram, or Rameswar
- Ram Mohun Roy
- Ramorino, Girolamo
- Ramsay, Allan
- Ramsay, Andrew Crombie
- Regiomontanus
- Reno
- Rhine
- Rhine, Province of the
- Rhode Island
- Ribault, Jean
- Richmond (Virginia)
- Richmond (Indiana)
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- Roebling, John Augustus
- Rohlfs, Gerhard
- Rokitansky, Karl
- Roland
- Roland de la Platière, Jean Marie and Marie
- Ronge, Johannes
- Roth, Rudolf
- Rothe, Richard
- Rothermel, Peter F.
- Rotteck, Karl von
- Ruschenberger, William S. W.
- Rush (plant)
- Rush (county)
- Rush, Benjamin
- Rustige, Heinrich von
- Rüstow, Wilhelm
- Ruta Baga
- Rutgers College
- Ruth, Book of
- Rutledge, John
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