The Mansfield Cut Underwater Archeological District is an 18.31-acre (74,100 m) area located near the city of Port Mansfield, Texas, United States, in the waters off Kenedy County and Willacy County, Texas. Located offshore in the Gulf of Mexico near the Port Mansfield Cut, the site is the location of the Mansfield Cut Wrecks and has been listed on the National Register of Historic Places since 1974.