RET
- Blăjeni
- Breathability
- RET proto-oncogene
- Rapid-exit taxiway
- Rational Emotive Therapy
- Rational Expectations Theory
- Registered engineering technologist
- Rehabilitation engineering technologist
- Renewable energy target
- Renewable energy technology
- Research Experiences for Teachers
- Resistance exercise training
- Resolution enhancement technology
- Resonance energy transfer
- Ret Chhon
- Ret Chol
- Ret Turner
- Retatrutide
- Retford railway station
- Reticulum
- Rotterdamse Elektrische Tram
- Russell Education Trust
- Røst Airport