Rei
- Aleksander Rei
- August Rei
- Cristo Rei (disambiguation)
- Eusébio
- Higurashi When They Cry
- International Conference on Radiation Effects in Insulators
- Leino Rei
- Pelé
- REI
- Reaction Engines
- Rede de Emissoras Independentes
- Redlands Municipal Airport
- Rei (footballer)
- Rei (given name)
- Rei (singer)
- Rei (wrestler)
- Rei Rei
- Reigate railway station
- Reihaneh Safavi-Naini
- Reis (disambiguation)
- Reli language
- Remote error indication
- Reproductive endocrinology and infertility
- Rey (disambiguation)
- Sofia Rei