| Rize Province | Rize |
| Riñihue Lake | Lac Riñihue |
| Riđica | Riđica |
| RK Zagreb | RK Zagreb |
| RKKY interaction | Couplage RKKY |
| RKO Pictures | RKO Pictures |
| RL circuit | Circuit RL |
| RLC circuit | Circuit RLC |
| RLE | Run-length encoding |
| Rlogin | Rlogin |
| RM | RM |
| RMS Aquitania | RMS Aquitania |
| RMS Britannic | Britannic |
| RMS Carpathia | RMS Carpathia |
| RMS Lusitania | RMS Lusitania |
| RMS Mauretania | RMS Mauretania |
| RMS Niagara | Niagara |
| RMS Olympic | RMS Olympic |
| RMS Queen Mary | Queen Mary |
| RMS Titanic | Titanic |
| RMVB | RMVB |
| Rn | Radon |
| RNA | A.R.N. |
| RNA interference | Interférence ARN |
| RNA polymerase | ARN polymérase |
| RNA virus | Virus à ARN |
| RNA world hypothesis | Hypothèse du monde à ARN |
| RO | RO |
| Ro ro ship | Ferry |
| Ro ro vessel | Ferry |
| ROA | Roa |
| roach | blatte d'Amérique |
| road | chemin |
| Road bicycle racing | Cyclisme sur route |
| Road hockey | Street-hockey |
| road map | carte routière |
| Road map for peace | Feuille de route pour la paix |
| road metal | gravillon |
| road network | réseau routier |
| Road of Bones | Route des os |
| Road of the Seven Lakes | Route des Sept Lacs |
| road roller | rouleau compresseur |
| road safety | sécurité routière |
| Road safety camera | Radar automatique |
| road salt | sel d'épandage |
| road sign | panneau de signalisation |
| Road signs in Sweden | Signalisation routière horizontale |
| Road surface marking | Signalisation routière horizontale |
| road sweeper | balayeur |
| road tax | impôt routier |
| road test | essai sur route |
| Road to Perdition | Les Sentiers de la perdition |
| road to success | chemin du succès |
| Road Town | Road Town |
| road traffic | circulation |
| Road traffic regulations | Code de la route |
| Road transport | Trafic routier |
| Road Warrior Animal | Joe Laurinaitis |
| Road Warrior Hawk | Michael Hegstrand |
| road where stopping is prohibited | route à stationnement interdit |
| Road Wild | WCW Road Wild |
| road worker | cantonnier |
| Road-rail vehicle | Rail-route |
| Road-rule enforcement camera | Radar automatique |
| Road-traffic safety | Prévention et sécurité routières |
| roadability | tenue de route |
| roadbase | grave |
| roadblock | barrage routier |
| roadrunner | géocoucou |
| Roadrunner Records | Roadrunner Records |
| Roads in Senegal | Liste des routes du Sénégal |
| roadside | bord |
| roadside bomb | engin explosif improvisé |
| roadside hawk | buse à gros bec |
| Roadside Picnic | Pique-nique au bord du chemin |
| roadstead | rade |
| roadster | roadster |
| roadway | chaussée |
| roadwork | travaux publics |
| roadworthy | en état de marche |
| Roald Amundsen | Roald Amundsen |
| Roald Dahl | Roald Dahl |
| Roald Hoffmann | Roald Hoffmann |
| roam | errer |
| roaming | itinérance |
| Roane County | Comté de Roane |
| Roanne | Roanne |
| Roanoke Colony | Roanoke |
| roar | brailler |
| roar with laughter | éclater de rire |
| roaring | hurlant |
| roaring drunk | beurre |
| roaring success | succès fou |
| Roaring Twenties | Années folles |
| roast | réprimander |
| roast beef | rosbif |
| Roast duck | Canard rôti |
| roasting | réprobation |
| roasting pan | plat à rôtir |
| rob | voler |
| Rob Blake | Rob Blake |
| Rob Bourdon | Rob Bourdon |
| Rob Dougan | Rob Dougan |
| Rob Halford | Rob Halford |
| Rob Lee | Robert Lee |
| Rob Niedermayer | Rob Niedermayer |
| rob of | enlever |
| Rob Pike | Rob Pike |
| Rob Rensenbrink | Robert Rensenbrink |
| Rob Roy | Rob Roy |
