USS Munargo (AP-20) was a commercial vessel-class transport acquired by the U.S. Navy for service as a troop carrier during World War II. She operated in the Atlantic Ocean, and, during the war, she was converted into a U.S. Army Hospital ship and renamed Thistle. Munargo (AP 20) was completed in December 1921 by New York Shipbuilding Corp., Camden, New Jersey; acquired by the Navy from the Army 6 June 1941; and commissioned 4 June 1941, Comdr. Harold F. Ely in command.