| RL circuit | Circuito RL |
| RLC circuit | Circuito RLC |
| RLE | Codificação Run-length |
| RMS Aquitania | Aquitânia |
| RMS Britannia | RMS Britannia |
| RMS Britannic | HMHS Britannic |
| RMS Lusitania | RMS Lusitania |
| RMS Mauretania | RMS Mauretania |
| RMS Niagara | Niágara |
| RMS Olympic | RMS Olympic |
| RMS Queen Mary | RMS Queen Mary |
| RMS Titanic | RMS Titanic |
| RMVB | RMVB |
| Rn | Rádon |
| RNA | ARN |
| RNA interference | Rna de Interferência |
| RNA polymerase | ARN-polimerase |
| RNA virus | Vírus ARN |
| Ro ro ship | Balsa |
| Ro ro vessel | Balsa |
| roach | barão |
| roachion | guimbae |
| road | estrada |
| road agent (Old West slang) | salteador |
| Road bicycle racing | Ciclismo de estrada |
| road map | mapa |
| road metal | cascalho |
| road network | redes rodoviárias |
| road roller | rolo compressor |
| road safety | segurança nas estradas |
| Road safety camera | Radar |
| road salt | sal para degelar estradas |
| road sign | placa de trânsito |
| road signs | sinalização |
| road sweeper | varredor |
| road tax | imposto rodoviário |
| road test | exame prático |
| Road to Perdition | Road to Perdition |
| road to success | caminho do sucesso |
| Road Town | Road Town |
| road traffic | fluxo |
| road where stopping is prohibited | acostamento |
| road worker | trabalhador de rua |
| road-metal | estrada-metal |
| Road-rule enforcement camera | Radar |
| roadability | estabilidade |
| roadblock | barricada |
| Roadian | Roadiano |
| roadie | músico |
| roadmapr bearer | mapa de estrada |
| roadrunner | papa-léguas |
| Roadrunner Records | Roadrunner Records |
| Roadrunner United | Roadrunner United |
| Roads in Portugal | Plano Rodoviário Nacional |
| roadside | beira da estrada |
| roadside hawk | gavião-carijó |
| roadstead | angra |
| roadster | barata |
| Roadsweeper | Vasculhador |
| roadway | estrada |
| roadworthy | em condições de uso |
| Roald Amundsen | Roald Amundsen |
| Roald Dahl | Roald Dahl |
| Roald Hoffmann | Roald Hoffmann |
| roam | perambular |
| roan antelope | palanca |
| Roane County | Condado de Roane |
| Roanoke Colony | Roanoke |
| Roanoke Island | Ilha de Roanoke |
| roar | gritar |
| roar with laughter | morrer de rir |
| roaring | rugidor |
| roaring drunk | bêbado |
| roaring success | sucesso extraordinário |
| roast | censurar |
| roast beef | rosbife |
| roaster | grelhaa |
| roastery | algo posto para assar algumas |
| roasting | sabão |
| roasting pan | panela |
| roasty | assadura |
| rob | roubar |
| Rob Bourdon | Rob Bourdon |
| Rob Halford | Rob Halford |
| Rob Lee | Rob Lee |
| Rob Levin | Rob Levin |
| rob of | tomar |
| Rob Pike | Rob Pike |
| Rob Rensenbrink | Rob Rensenbrink |
| Rob Roy | Rob Roy |
| Rob Van Dam | Rob Van Dam |
| Rob Zombie | Rob Zombie |
| Robben Island | Ilha Robben |
| robber | assaltante |
| robber baron | barão-ladrão |
| robbery | roubo |
| robbery with violence | roubo seguido de violência |
| Robbie McEwen | Robbie McEwen |
| Robbie Williams | Robbie Williams |
| robbing | assalto |
| Robby Krieger | Robby Krieger |
| Robby the Robot | Robby - O Robô |
| robe | roupão |
| Robert | Roberto |
| Robert A. Heinlein | Robert A. Heinlein |
