RTR
- CAN bus
- HP RTR
- RTR Vehicles
- RTRFM
- Radiotelevisiun Svizra Rumantscha
- Real-time recovery
- Reformed Theological Review
- Remedios T. Romualdez
- Rent the Runway
- Retracted tongue root
- Return to Ravnica
- Rigs-to-Reefs
- Rochester railway station
- Rossiya 1
- Royal Tank Regiment
- Royal Tasmania Regiment
- Rubber Tramp Rendezvous
- Russian Tea Room
- Third Republic Movement
- Unix RTR