USS Mirth (AM-265) was an built for the United States Navy during World War II. In 1945, she was transferred to the Soviet Navy under Lend-Lease as T-274. The Soviets converted her into a naval trawler in 1948 and renamed her Musson. She was stricken in 1964, never having been returned to U.S. custody. Because of the Cold War, the U.S. Navy was unaware of this fate and the vessel remained on the American Naval Vessel Register until she was struck on 1 January 1983.