The AN/SPG-53 was a United States Navy Gun Fire-control radar (International Telecommunication Union classification: radiolocation land station in the radiolocation service), used in conjunction with the Mark 68 gun fire-control system. It was used with the 5"/54 caliber Mark 42 gun system aboard Belknap-class cruisers, Mitscher-class destroyer), Forrest Sherman-class destroyer), Farragut-class destroyer) (1958) and Charles F. Adams-class destroyer)s and Knox-class frigates of the US Navy, as well as Australian Perth-class destroyer) s and Spanish Baleares-class frigate s.