Prison or penitentiary, is a correctional facility.
Penitentiary may also refer to:
- Apostolic Penitentiary, a tribunal of mercy, responsible for issues relating to the forgiveness of sins in the Roman Catholic Church
- canon penitentiary, a clergyman attached to a major church to serve as a general confessor
- Penitentiary (1938 film)
- Penitentiary (1979 film)
- Penitentiary Point, a cliff in Utah