| reactor | reactor |
| Read It and Weep | Read It and Weep |
| Read Only Memory | ROM |
| Read the Fucking Manual | RTFM |
| Reading and Leeds Festivals | Reading and Leeds Festivals |
| Ready For Romance | Ready for Romance |
| ReadyBoost | ReadyBoost |
| Readymade | Found art |
| Reagandoctrine | Reagan Doctrine |
| reageerbuis | test tube |
| reageerbuisbaby | test-tube baby |
| reagens | agent |
| reageren | respond |
| reageren op | react to |
| reageren tegen | react against |
| Real | Brazilian real |
| Real Academia Española | Real Academia Española |
| Real Betis | Real Betis |
| Real Cartagena | Real Cartagena |
| Real Conservatorio Superior de Música de Madrid | Madrid Conservatory |
| Real de Banjul FC | Real de Banjul Football Club |
| Real de Montroi | Real de Montroi |
| Real Irish Republican Army | Real Irish Republican Army |
| Real Jaén | Real Jaén |
| Real Madrid Baloncesto | Real Madrid Baloncesto |
| Real Madrid C | Real Madrid C |
| Real Madrid Castilla | Real Madrid Castilla |
| Real Mallorca | RCD Mallorca |
| Real Murcia | Real Murcia |
| Real Oviedo | Real Oviedo |
| Real Sociedad | Real Sociedad |
| Real Time Streaming Protocol | Real Time Streaming Protocol |
| Real Unión de Irún | Real Unión |
| Real Valladolid | Real Valladolid |
| Real Vigo Sporting | Real Vigo Sporting |
| Real Zaragoza | Real Zaragoza |
| Real-time strategy | Real-time strategy |
| Real-Time Streaming Protocol | Real Time Streaming Protocol |
| Real-time transportprotocol | Real-time Transport Protocol |
| REALbasic | REALbasic |
| Realdoll | RealDoll |
| realisatie | realization |
| realiseerbaar | accomplishable |
| realiseren | perform |
| realisme | realism |
| realist | realist |
| realiste | realist |
| realistisch | practical |
| realiteit | actuality |
