| Ra | Ra |
| rabarber | ruibarbo |
| rabat | descuento |
| Rabaud Henri | Rabaud Henri |
| rabbiner | rabino |
| Rabindranath Tagore | Rabindranath Tagore |
| Rabobank | Rabobank |
| Race | Raza |
| Racehund | Raza de perro |
| Racelære | Racialismo |
| Rachel Bilson | Rachel Bilson |
| Rachel Carson | Rachel Carson |
| Rachel Green | Rachel Green |
| Rachel Hurd-Wood | Rachel Hurd-Wood |
| Rachel McAdams | Rachel McAdams |
| racisme | racismo |
| Racquetball | Raquetbol |
| rad | pista |
| Radagast | Radagast el Pardo |
| radar | radar |
| Radeløv | Asplenium |
| Radeløv-familien | Aspleniaceae |
| Radian | Radián |
| radio | radio |
| Radio Data System | Radio Data System |
| radioaktiv dekontaminering | descontaminación radiactiva |
| radioaktiv emission | emisión radiactiva |
| radioaktiv kontaminering | contaminacíon radiactiva |
| radioaktiv regn | suspensión a causa de la lluvia |
| radioaktivitet | radioactividad |
| radioaktivt affald | residuos radiactivos |
| radioaktivt depot | vertidos radiactivos |
| radioaktivt forurenende stof | contaminantes radiactivos |
| radioaktivt nedfald | polvillo |
| radioaktivt sporstof | trazador radiactivo |
| radioaktivt stof | sustancias radiactivas |
| Radioamatør | Radioafición |
| Radioantenne | Antena |
| Radioastronomi | Radioastronomía |
| Radiobølger | Onda de radio |
| radioelement | cuerpo simple radiactivo |
| Radiofjernstyring | Radiocomando |
| radiofoni | radio |
| Radioforsats | Tuning |
| Radiohead | Radiohead |
| Radioisotopgenerator | Generador termoeléctrico de radioisótopos |
| radiologi | radiología |
| Radiomodtager | Receptor de radio |
| Radionet | Red inalámbrica |
| radionuklid | radionúclido |
| Radiosender Gleiwitz | Operación Himmler |
| radioudsendelse | programa de radio |
| Radiserne | Peanuts |
| Radits | Raditz |
| radium | radio |
| Radius | Radio |
| Radix | Raíz |
| radon | radón |
| Radovan Karadžić | Radovan Karadžić |
| Rael | Rael |
| Raetia | Recia |
| RAF | RAF |
| Rafael Márquez | Rafael Márquez |
| Rafael Nadal | Rafael Nadal |
| Raffaello Santi | Rafael Sanzio |
| raffinaderi | refinería |
| raffinering | refino |
| raffinering af kul | refino del carbón |
| Rage Against the Machine | Rage Against the Machine |
| Ragnar Frisch | Ragnar Frisch |
| Ragnar Granit | Ragnar Granit |
| Ragnarok Online | Ragnarok Online |
| Ragusa | Provincia de Ragusa |
| RAID | RAID |
| Rain Man | Rain Man |
| Rainbow Warrior | Rainbow Warrior |
| Rainer Bonhof | Rainer Bonhof |
| Rainer Maria Rilke | Rainer Maria Rilke |
| Rainer Werner Fassbinder | Rainer Werner Fassbinder |
| Rainier Wolfcastle | Rainier Wolfcastle |
| Raivis Belohvoščiks | Raivis Belohvosciks |
| Rajab | Rayab |
| Rajasthan | Rayastán |
| Rajgræs | Lolium |
| Rakel | Raquel |
| Raket | Cohete |
| Raketfly | Avión cohete |
| Raki | Rakı |
| Rakim | Rakim y ken-y |
| rakitis | raquitismo |
| Raku | Raku |
| ral | gravilla |
| Raleigh | Raleigh |
| Rally | Rally |
| Ralph Nader | Ralph Nader |
| Ralph Waldo Emerson | Ralph Waldo Emerson |
| Ralph Wiggum | Ralph Wiggum |
| RAM | Memoria de acceso aleatorio |
| Rama | Rāma |
| Ramadan | Ramadán |
| Ramallah | Ramala |
| Ramana Maharshi | Ramana Maharshi |
| Ramat Gan | Ramat Gan |
| Rambo III | Rambo III |
| Rambouillet | Distrito de Rambouillet |
| rambuk | ariete |
