USS Giansar (AK-111) was a Crater-class cargo ship originally laid down as the liberty ship SS Thomas Ewing. The ship was taken over by the United States Navy and renamed in 1943. After being decommissioned in 1945, Giansar was returned to the Maritime Commission. She was scrapped in 1963. The ship's original name honored Thomas Ewing, an American politician from Virginia. The name Giansar is after the star in the constellation Draconis.