| rayon | rayón |
| Raysko Praskalo | Raysko Praskalo |
| raze | eliminar |
| Raziel | Raziel |
| Razin effect | Efecto Razin |
| razor | afeitadora |
| razor blade | hoja de afeitar |
| Razor-billed Curassow | Mitu tuberosa |
| razor-sharp | muy afilado |
| Razor-shell | Cuchillo |
| razorbill | alca |
| Razorlight | Razorlight |
| razz | alzar |
| Razès | Rasez |
| Raël | Rael |
| Raëlism | Movimiento raeliano |
| Raï | Raï |
| Raúl Alarcón | Raúl Alarcón |
| Raúl Alcalá | Raúl Alcalá |
| Raúl Alfonsín | Raúl Alfonsín |
| Raúl Baduel | Raúl Isaías Baduel |
| Raúl Bravo | Raúl Bravo Sanfélix |
| Raúl Castro | Raúl Castro |
| Raúl Francisco Primatesta | Raúl Primatesta |
| Raúl García | Raúl García Escudero |
| Raúl González | Raúl González |
| Raúl Juliá | Raúl Juliá |
| Raúl Prebisch | Raúl Prebisch |
| Raúl Salinas de Gortari | Raúl Salinas de Gortari |
| Raúl Sanguineti | Raúl Sanguineti |
| Raúl Solnado | Raul Solnado |
| Raül López | Raúl López Molist |
| Raška | Rascia |
| Rb | Rubidio |
| RBMK | RBMK |
| RC | RC |
| RC circuit | Circuit RC |
| RC Lens | Racing Club de Lens |
| RC oscillator | Oscilador electrónico |
| RC Strasbourg | Racing Club de Strasbourg |
| RCA | Radio Corporation of America |
| RCA connector | Conector RCA |
| RCB star | Estrella RCB |
| RCD Espanyol | Real Club Deportivo Español |
| RCD Espanyol B | Real Club Deportivo Espanyol B |
| RCD Mallorca | Real Club Deportivo Mallorca |
| RCMA star | Estrella RCMA |
| RCP | Rcp |
| RDBMS | Sistema de administración de |
| RDF Schema | RDF Schema |
| RDF Site Summary | RSS |
| RDRAM | RIMM |
| RDX | RDX |
| re | con referencia a |
| re-create | recrear |
| re-do | rehacer |
| re-education | reeducación |
| re-entrant | entrante |
| re-examination | nuevo examen |
| re-form | formar de nuevo |
| Re-run | Cover |
| reabsorb | resorber |
| reabsorption | reabsorción |
| reach | dar |
| reach a deadlock | estancarse |
| reach a decision | llegar a una conclusión |
| reach an agreement | llegar a un arreglo |
| reach destination | llegar |
| reach for | alcanzar |
| reach out | extender |
