The Cadillac Gage Ranger, known popularly and in United States military service as the Cadillac Gage Peacekeeper or Cadillac Gage Peacekeeper I, is a four-wheeled armored personnel carrier marketed as an internal security vehicle, produced by Cadillac Gage. Built on a Dodge truck chassis, production began in 1979 to produce an armored vehicle for the United States Air Force (USAF) Security Forces, its largest customer, though Luxembourg and Indonesia also reportedly used Rangers as well. The Ranger also saw considerable service with law enforcement as a SWAT vehicle.

A SWAT vehicle, police armored vehicle, or police rescue vehicle is a non-military armored vehicle used by police tactical units to respond to incidents. They are most often in configurations similar to military light utility vehicles, infantry mobility vehicles, or armoured personnel carriers. They are generally designed to have armor that can sufficiently block high-caliber rounds, space to carry the unit's equipment, and sufficient passenger seating; some also allow for additional personnel to hang onto the side of the vehicle in transit.