| ritualistic | ritualista |
| ritually | solemne |
| ritzy | de alta calidad |
| Riu Ripoll | Río Ripoll |
| Rius | Eduardo del Río |
| Riva | Banco |
| Riva San Vitale | Riva San Vitale |
| Rivadavia Partido | Rivadavia |
| rival | antagonista |
| Rivaldo | Rivaldo |
| rivaling | rival |
| rivalling | rival |
| rivalry | rivalidad |
| Rivas | Rivas |
| Rivastigmine | Rivastigmina |
| Rivaz | Rivaz |
| Rivea corymbosa | Rivea corymbosa |
| Rivendell | Rivendel |
| river | río |
| River Bann | Bann |
| River Barrow | Río Barrow |
| river bed | lecho de río |
| River Bend Nuclear Generating Station | Planta de energía nuclear River Bend |
| River bifurcation | Bifurcación de un río |
| River Boyne | Boyne |
| River Cadagua | Río Cadagua |
| River Clyde | Río Clyde |
| River Corrib | Río Corrib |
| River Cray | Río Cray |
| River delta | Delta fluvial |
| River Don | Río Don |
| River Erne | Río Erne |
| River Foyle | Foyle |
| River Great Ouse | Ouse |
| River horses | Hippopotamidae |
| River Kelvin | Río Kelvin |
| River kingfishers | Alcedines |
| River Lagan | Lagan |
| River lamprey | Lampetra fluviatilis |
| River Lethe | Lete |
| River Liffey | Río Liffey |
| River Medway | Río Medway |
| River Mersey | Mersey |
| River mouth | Enbocadura |
| River Ness | Neso |
| River Nile | Río Nilo |
| River Nore | Río Nore |
| River of No Return | Río sin retorno |
| River Phoenix | River Phoenix |
| River Plate | Río de la Plata |
| River Severn | Río Severn |
| River Shannon | Río Shannon |
| River Sirion | Río Sirion |
| River Spey | Río Spey |
| River Suir | Suir |
| River Taff | Río Taff |
| River Tees | Río Tees |
| River Tern | Río Tern |
| River Thames | Támesis |
| River Tigris | Tigris |
| River Torrens | Río Torrens |
| River Trent | Río Trent |
| River Ure | Río Ure |
| river water | agua de río |
| River Westbourne | Río Westbourne |
| River whaler | Carcharhinus leucas |
| riverbank | orilla |
| riverbed | lecho del río |
| riverboat | barco fluvial |
| Riverense Portuñol | Portuñol |
| Riverine Rabbit | Bunolagus monticularis |
| Rivers of Beleriand | Teiglin |
| Rivers of Gondor | Harnen |
| Rivers of Ireland | Ríos de Irlanda |
| Rivers of Middle-earth | Poros |
| Rivers State | Ríos |
| riverside | ribera |
| Riverside International Raceway | Riverside |
| Riverworld | Mundo del Río |
| rivet | remache |
| riveter | remachadora |
| riveting | remachado |
| Riviera | Distrito de Riviera |
| Rivière | Riviera |
| Rivière du Rempart | Distrito de Rivière du Rempart |
| Rivne Oblast | Óblast de Rivne |
| rivulet | arroyo |
| Riyad Province | Riad |
| Riyadh | Riad |
| Riyadh Province | Riad |
| Riyo Mori | Riyo Mori |
| Rize Province | Provincia de Rize |
| Riñihue Lake | Lago Riñihue |
| RK Zagreb | RK Zagreb |
| RKO Pictures | RKO Pictures |
| RLC circuit | Circuito resonante |
| RLE | Run-length encoding |
| Rlogin | Rlogin |
| RMI-IIOP | RMI-IIOP |
| RMS Aquitania | Aquitania |
| RMS Britannic | HMHS Britannic |
| RMS Carpathia | RMS Carpathia |
| RMS Lusitania | RMS Lusitania |
| RMS Mauretania | RMS Mauretania |
| RMS Niagara | Niágara |
| RMS Olympic | RMS Olympic |
| RMS Queen Mary | Queen Mary |
| RMS Titanic | RMS Titanic |
| RMVB | RMVB |
| Rn | Radón |
| RNA | ácido ribonucleico |
| RNA interference | Ribointerferencia |
| RNA polymerase | ARN polimerasa |
| RNA virus | Virus ARN |
| RNA world hypothesis | Hipótesis del mundo de ARN |
| RNB | RNB |
| Ro ro ship | Transbordador |
| Ro ro vessel | Transbordador |
| roach | cucaracha |
| road | calle |
| road accident | accidente de tráfico |
| Road bicycle racing | Ciclismo |
| road map | hoja de ruta |
| road metal | grava |
| road network | red de carreteras |
| Road of Bones | Río Kolyma |
| Road of Life | Camino de la Vida |
| Road of the Seven Lakes | Camino de los Siete Lagos |
| road roller | apisonadora |
| road safety | seguridad en carretera |
| Road safety camera | Radar de tráfico |
| road salt | sal para deshielo de carreteras |
| road sign | señal de tráfico |
| road sweeper | barrendero |
| road tax | impuesto de carreteras |
