- A city and village in Missouri, United States.
- A female given name.
- A surname.
- The River Rea in Birmingham, England, which flows into the River Tame.
- The River Rea, Shropshire and Worcestershire, England, which flows into the River Teme.
- The Rea River in Fiordland, New Zealand, which flows into Bradshaw Sound.
- Aries (constellation)