| Rayonnisme | Rayonism |
| Rayons cathodiques | Cathode rays |
| Rayons cosmiques | Cosmic ray |
| Rayons cosmiques secondaires | Secondary cosmic ray |
| rayons gamma | gamma rays |
| Rayons ultraviolets | Ultraviolet irradiation |
| rayons X | X-rays |
| Rays de Tampa Bay | Tampa Bay Rays |
| rayure | scratch |
| rayure très fine | pinstripe |
| rayé | streaky |
| raz de marée | tsunami |
| raz-de-marée | tidal wave |
| Razer USA | Razer USA Ltd |
| Razgrad | Razgrad Province |
| Raziel | Raziel |
| Razlog | Razlog |
| Razorlight | Razorlight |
| Razvan Florea | Răzvan Florea |
| Razzie Awards | Golden Raspberry Awards |
