Prison ship

A prison ship is a starship used to contain and transport prisoners between penal colonies. These ships are often, but not always, converted from large freighters, or in some cases decomissioned starliners.
== Known prison ships ==
=== United Nations Space Command ===
* Mona Lisa - converted Oberth-class heavy freighter, destroyed by the prowler Red Horse after being overrun by the Flood.
* UNSC Alcatraz - converted Concordia-class starliner commanded by Captain Mayers.
=== Covenant ===
=== Galactic Republic ===
* Purgatory - Purgatory-class prison ship, later repurposed as a slave ship during the Galactic Civil War.
=== Galactic Empire ===
* Purge - Imperial prison barge used during the Galactic Civil War.
=== New Republic ===
* Night Buzzard - Oubliette-class transport in service with the New Republic Correctional Department.
=== Galactic Alliance ===