USS Cassiopeia (AK-75) was a Crater-class cargo ship in the service of the United States Navy in World War II. It was the only ship of to bear this name. It is named after the northern hemisphere constellation Cassiopeia. Cassiopeia was launched 15 November 1942 as liberty ship SS Melville W. Fuller (MCE hull 504) by Permanente Metals Corporation, Richmond, California, under a Maritime Commission contract; sponsored by Mrs. C. F. Calhoun; acquired by the Navy 27 November 1942; and commissioned 8 December 1942, Lieutenant Commander W. E. Carlson in command.