Other
- Higurashi Rei, the third season of an anime
- REI, a sporting goods and outdoor gear consumer cooperative
- Reproductive Endocrinology and Infertility - a branch of Obstetrics and Gynecology
- Rei Momo (Carnival character)
- Rei Momo, an album
- Rei vindicatio
- REI, FAA/IATA identifier for Redlands Municipal Airport a public use airport in Redlands, California, United States
- Rei, Portuguese name for a King in Chess
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