Pelican Bay State Prison (PBSP) is a supermax prison facility in Crescent City, California. The 275-acre (111 ha) prison takes its name from a shallow bay on the Pacific coast, about 2 mi (3.2 km) to the west.

A super-maximum security (supermax) or administrative maximum (ADX) prison is a "control-unit" prison, or a unit within prisons, which represents the most secure level of custody in the prison systems of certain countries.