USFS Penguin was an American cargo liner in commission in the fleet of the United States Bureau of Fisheries from 1930 to 1940 and, as US FWS Penguin, in the fleet of the U.S. Fish and Wildlife Service from 1940 to 1950. She ran a passenger-cargo service between Seattle, Washington, and the Pribilof Islands, and provided transportation between the two inhabited Pribilofs, Saint Paul Island and St. George Island. She also carried passengers, supplies, and provisions to destinations on the mainland of the Territory of Alaska and in the Aleutian Islands. She occasionally supported research activities in Alaskan waters and the North Pacific Ocean.