R3
- 3R (disambiguation)
- BBC Radio 3
- Canon EOS R3
- DFW R.III
- DVD region code
- ISO Recommendation R3
- Jaguar R3
- K-13 (missile)
- Leica R3
- List of aircraft (An–Az)
- Loring R-III
- Media/Wawa Line
- Proton R3
- R (disambiguation)
- R-3 motorway (Spain)
- R-3 tank
- R-5 Pobeda
- R03 (disambiguation)
- R3 (RER Vaud)
- R3 (Rodalies de Catalunya)
- R3 (TV series)
- R3 (ring road)
- R3 (video game)
- R3 Lougheed Hwy
- R3 expressway (Czech Republic)
- R3 expressway (Slovakia)
- R3 road (Zimbabwe)
- R3.0
- R3.0 (concert)
- Radial Road 3
- Receptor (biochemistry)
- Reduce, reuse, recycle
- Resistance 3
- Rheintochter
- Ross R-3
- SAP R/3
- Tupolev R-3
- Type R print
- West Trenton Line
- Yakutia Airlines
- Yamaha YZF-R3
- Ågesta Nuclear Plant