| revorm | ringworm |
| Revormstörel | Euphorbia helioscopia |
| revy | review |
| Rex | Rex |
| Rex Stout | Rex Stout |
| Rexall Place | Rexall Place |
| Rexhep Meidani | Rexhep Meidani |
| Rexism | Rexism |
| Rexkanin | Rex |
| REXX | REXX |
| Rey Mysterio | Oscar Gutierrez |
| Reyes Católicos | Catholic Monarchs |
| Reykjanesbær | Reykjanesbær |
| Reykjanesskagi | Reykjanes |
| Reykjavik | Reykjavik |
| Reykjavíks flygplats | Reykjavík Airport |
| Reynald av Châtillon | Raynald of Chatillon |
| Reynolds transportteorem | Reynolds transport theorem |
| Reynoldstal | Reynolds number |
| Reyðarfjörður | Borgarfjörður |
| Reza Pahlavi | Reza Shah |
| Reza Pahlavi II | Reza Pahlavi |
| Rezidor | Rezidor Hotel Group |
| Reşiţa | Reşiţa |
| RF | RF |
| RFID | RFID |
| RFS Pjotr Velikij | Russian battlecruiser Pyotr Velikiy |
| RGB | RGB |
| RGBA | RGBA color space |
| Rh-faktor | Rh factor |
| Rhabdodontider | Rhabdodontidae |
| Rhabdoviridae | Rhabdoviridae |
| Rhadamantys | Rhadamanthus |
| Rhakotis | Rhakotis |
| Rhamnales | Rhamnales |
| Rhapsody in Blue | Rhapsody in Blue |
| Rhapsody of Fire | Rhapsody of Fire |
| Rhea | Rhea |
| Rheine | Rheine |
| RheinEnergie Köln | RheinEnergie Köln |
| RheinEnergieStadion | RheinEnergieStadion |
| Rheinfelden | Rheinfelden |
| Rheinland-Pfalz | Rhineland-Palatinate |
| Rheinpark Stadion | Rheinpark Stadion |
| Rheintochter | Rheintochter |
| Rhen | Rhine |
| Rhenfallet | Rhine Falls |
| Rhenförbundet | Confederation of the Rhine |
| Rhenguldet | Das Rheingold |
| rhenium | rhenium |
| Rhenlandet | Rhineland |
| rhensk | Rhenish |
| rhesusfaktor | Rh factor |
| Rhianos | Rhianus |
| Rhindpapyrusen | Rhind Mathematical Papyrus |
| Rhipsalis | Rhipsalis |
| rhizom | rhizome |
| Rho | Rho |
| Rho Cassiopeiae | Rho Cassiopeiae |
| Rhode | Rhode |
| Rhode Island | Rhode Island |
| Rhode Islands flagga | Flag of Rhode Island |
| Rhodes | Rhodes piano |
| Rhodesia | Rhodesia |
| Rhodesian Ridgeback | Rhodesian Ridgeback |
| rhododendron | rosebay |
| Rhodos | Rhodes |
| Rhomboideus major | Rhomboid major muscle |
| Rhona Mitra | Rhona Mitra |
| Rhondda Cynon Taff | Rhondda Cynon Taff |
| Rhoneviner | Rhône wine |
| Rhuddlanstadgan | Statute of Rhuddlan |
| Rhys ap Gruffydd | Rhys ap Gruffydd |
| Rhythm and blues | Rhythm and blues |
| Rhythmophone | Rhythmophone |
| Rhätische Bahn | RhB |
| Rhäzüns | Rhäzüns |
| Rhône | Rhone |
| Rhône-Alpes | Rhône-Alpes |
| Rhön | Rhön Mountains |
| RI | RI |
