| R Monocerotis ... Racine, Jean |
| racism ... radiolarian |
| radiology ... Rahner, Karl |
| Rahr Plains ... Rajapalaiyam |
| Rajasthan ... Ramakrishna |
| Ramakrishna Mission ... Ramsay, Allan |
| Ramsay, Allan ... Randolph, Edward |
| Randolph, John ... rapparee |
| rapporteur ... Rathbone, Basil |
| Rathbun, Mary Jane ... Rawson |
| Rawsthorne, Alan ... Reader's Digest |
| readerly and writerly ... Recklinghausen, Friedrich Daniel von |
| Reclus, Elisee ... Red River Settlement |
| Red Rock River ... Redstone, Sumner |
| reduccion ... refraction |
| refractive index ... Reichenau, Walther von |
| Reichenbach Falls ... relapsing fever |
| relative aperture ... renal capsule |
| renal carcinoma ... renormalization |
| Renouvier, Charles-Bernard ... Resende, Garcia de |
| reserpine ... retaining wall |
| Retalhuleu ... Reventlow, Christian Ditlev Frederik, Count |
| revenue bond ... Rhaetian Alps |
| Rhaetian dialects ... Rhodes |
| Rhodes scholarship ... Rialto Bridge |
| Riau ... ricercare |
| Rich, Adrienne ... Richemont, Arthur, Constable de |
| Richepin, Jean ... Ridgewood |
| Ridgway ware ... Rigel |
| Rigestan ... Ringer's solution |
| Ringerike ... Rishon LeZiyyon |
| rising sun ... Riversleigh fossils |
| Riverton ... Robbins, Jerome |
| Robbins, Lionel Charles Robbins, Baron ... Roberval balance |
| Roberval, Gilles Personne de ... Rochambeau, Jean-Baptiste-Donatien de Vimeur, comte de |
| Rochdale ... rocket and missile system |
| Rockettes, the ... Rodrigues Island |
| Rodrigues Lobo, Francisco ... Rohan Family |
| Rohan, Henri, duc de ... Rollo |
| Rolls, Charles Stewart ... Romanus III Argyrus |
| Romanus IV Diogenes ... roof |
| roof pendant ... Rose Theatre |
| rose window ... Ross, Harold W. |
| Ross, John ... Rothe, Richard |
| Rothenburg ob der Tauber ... Roussel, Albert |
| Roussillon ... Royal Armouries |
| Royal Astronomical Society ... rubber |
| Rubbia, Carlo ... Rudolf, Archduke and Crown Prince of Austria |
| Rudolf, Lake ... Rumoi |
| Rumor, Mariano ... Rushworth, John |
| Rusk, Dean ... rustication |
| Rustin, Bayard ... Rybnik |
| Rydberg constant ... |
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