Three ships in the United States Navy have been named USS Saco for the Saco River and for the Saco, Maine. The first was a gunboat launched in 1863, served in the American Civil War and sold in 1883. The second was a steam tugboat, built in 1912. She was acquired by the Navy in 1918 and served as a yard tug until 1927. The third was a yard tug launched into service in 1968 and struck from the Naval Vessel Register in 2005, after serving in Guam. United States Navy ship names