USS Marion County (LST-975) was an LST-542-class tank landing ship built for the United States Navy during World War II.

LST-975 was laid down on 1 December 1944, at Hingham, Massachusetts, by the Bethlehem-Hingham Shipyard; launched on 6 January 1945; sponsored by Miss Alice J. Varian; and commissioned on 3 February 1945.

LST-975 again got underway for Japan six days later, embarked men and equipment of the Army's 52nd Field Artillery Battalion at Mindanao, en route, and arrived at Maysuyama, on 25 October, to disembark passengers and cargo.

The ship spent the next five months conveying troops and equipment between the various ports of the Philippines until she decommissioned in Subic Bay, Luzon, on 16 April 1946, and was turned over to the Army for operations in the Far East.

With the need for shipping for an immediate large-scale lift of troops and supplies, LST-975 was assigned to the Military Sea Transportation Service (MSTS) on 1 July, to be crewed by Japanese civilians.

She again supported the deterrent efforts of the United Nations Forces in Korea from 4 April, during protracted armistice negotiations, until departing on 20 October, for the west coast.

[4] On 19 June 1953, LST-975 sailed via Seattle and Point Barrow, to resupply Distant Early Warning Line (DEWS) radar stations along the Arctic Circle.

From 23 to 26 March 1954, she participated in a simulated assault landing on Iwo Jima – nearly a decade after the World War II operation on 19 February 1945.

Renamed Marion County on 1 July 1955, she departed San Diego, on 9 January 1956, for training exercises off Hawaii and the Philippines.