USS Protector (AGR/YAGR-11) was a Guardian-class radar picket ship of the United States Navy.

A Liberty Ship acquired in 1957, she was reconfigured as a radar picket ship and assigned to radar picket duty in the North Atlantic Ocean as part of the Distant Early Warning Line.

[5][4] After shakedown off Guantanamo Bay, Cuba, Protector, homeported at Davisville, Rhode Island, reported to Commandant, 1st Naval District for administrative control and to Commander YAGR Division 21 for duty and was assigned as an Ocean Station Radar Picket Ship in the seaward extension of the Eastern Continental Air Defense Command (CONAD)'s Contiguous Radar Coverage System.

[5] Continuing her duties off the US East Coast, Protector was redesignated AGR-11 on 28 October 1958.

[5] On 28 July 1965, she decommissioned at Bayonne, New Jersey, and was placed in the US Maritime Administration (MARAD) National Defense Reserve Fleet, Hudson River Reserve Fleet, Jones Point, New York, as an Emergency Relocation Center Ship, where she remained until she was towed to the Norfolk Naval Shipyard where her engine was removed.