USS Lyman County (LST-903) was an LST-542-class tank landing ship built for the United States Navy during World War II. Named after Lyman County, South Dakota, she was the only U.S. Naval vessel to bear the name. Originally laid down as USS LST-903 by the Dravo Corporation of Pittsburgh, Pennsylvania on 15 October 1944; the ship was launched on 23 December 1944, sponsored by Mrs. E. W. Wilson; and commissioned at New Orleans, Louisiana on 20 January 1945 with Lieutenant John B. Darrow in command.