Radley Sanitarium is a mental health institution located close to Rosewood. It's currently closed.
- Bethany Young (prior to death)
- Charles DiLaurentis/CeCe Drake (prior to escape)
- Lesli Stone (formerly)
- Mona Vanderwaal (formerly)
- Big Rhonda
- Spencer Hastings (formerly)
- According to Jessica DiLaurentis, CeCe Drake checked in for a brief time as a joke. However, with the reveal that CeCe is Charlotte DiLaurentis, it is unclear how true this was.