USS Mahnomen County (LST-912) was a LST-542-class tank landing ship built for the United States Navy during World War II. Named after Mahnomen County, Minnesota, she was the only U.S. Naval vessel to bear the name. Originally laid down as LST-912 by the Bethlehem-Hingham Shipyard, Inc. of Hingham, Massachusetts on 5 February 1944; launched on 22 April 1944, sponsored by Mrs. Hazel B. Leppe; and commissioned on 21 May 1944 with Lieutenant Lloyd R. White in command.