USS Leonis (AK-128) was a Crater-class cargo ship in service with the United States Navy in World War II. It was the only ship of the Navy to have borne this name, the Latin form of the northern constellation Leo. Leonis was laid down 21 November 1942 as liberty ship SS Key Pittman (MCE hull 512) by Permanente Metals Corporation, Richmond, California, under a Maritime Commission contract in 1943; launched 22 December 1942 acquired by the Navy 6 October 1943; renamed Leonis 11 October and commissioned 25 October 1943; Lt. Comdr. A. J. Barkowsky in command.