- Rogers, John (sculptor)
- Rogers, Robert
- Rogers, Samuel
- Rogers, William
- Rogier, Charles Latour
- Rogue
- Rohan
- Rohan, Henri, Duc de
- Rohan, Louis René Édouard, Cardinal de
- Rohilkhand
- Rohilla
- Rohlfs, Friedrich Gerhard
- Rohtak
- Rojas Zorrilla, Francisco de
- Rokitansky, Carl, Freiherr von
- Roland, Jean Marie
- Roland, Legend of
- Rolandseck
- Roll, Alfred Philippe
- Roll
- Rolland, John
- Rolle de Hampole, Richard
- Roller (bird)
- Roller (agriculture)
- Roller-skating
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- Rome (Georgia)
- Rome (New York)
- Romé de l'Isle, Jean Baptiste Louis
- Romesh Chandra Mitra, Sir
- Romford
- Romilly, John Romilly, 1st Baron
- Romilly, Sir Samuel
- Romilly-sur-Seine
- Rominten
- Romney, George
- Romney, Henry Sidney, Earl of
- Romney
- Romorantin
- Romsdal
- Romsey
- Romulus
- Roncesvalles
- Ronconi, Giorgio
- Ronda
- Rondeau
- Rondel
- Rondo
- Ronsard, Pierre de
- Ronsdorf
- Röntgen, David
- Röntgen, Wilhelm Konrad
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- Röntgen Rays
- Rood
- Roofs
- Rook
- Rooke, Sir George
- Room
- Roon, Albrecht Theodor Emil, Count von
- Roorkee
- Roosevelt, Theodore
- Root, Elihu
- Root
- Rope and Rope-making
- Ropes, John Codman
- Rope-walking
- Rops, Félicien
- Roquelaure
- Rorqual
- Rorschach
- Ros
- Ros, Sir Richard
- Rosa, Carl August Nicholas
- Rosa, Monte
- Rosa, Salvator
- Rosaceae
- Rosamond
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