RT
- AEC Regent III RT
- Arty (disambiguation)
- IBM RT PC
- Lil RT
- Line 3 Scarborough
- R/T
- RT (TV network)
- RT (energy)
- RT America
- RT Arabic
- RT Documentary
- RT France
- RT Spanish
- RT UK
- RT!
- RT1 (disambiguation)
- Radiation therapy
- Radio Thailand
- Radio Times
- Radiotechnique
- Radiotelephone
- Rapid test
- Rapid transit
- Reaction time
- Real-time (disambiguation)
- Relevance theory
- Request Tracker
- Respiratory therapist
- Resuscitative thoracotomy
- Retweeting
- Reverse transcriptase
- Richter's transformation
- Right tackle
- Rooster Teeth
- Rostelecom
- Rotten Tomatoes
- Ruby Tuesday (restaurant)
- Rukun tetangga
- Russian Time
- Sacramento Regional Transit District
- The Right Honourable
- UVT Aero
- Windows RT