USS Lyman County (LST-903) was an LST-542-class tank landing ship built for the United States Navy during World War II.

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.

During the next seven weeks she participated in intensive amphibious training in Hawaiian waters; and, after embarking Army troops and loading LVTs, she sailed in convoy for the Marianas on 20 May.

At the conclusion of hostilities she was operating out of Saipan; thence from 23 to 29 August she steamed to Leyte Gulf for supply runs among the Philippine Islands.

Between 20 September and 4 November she made two runs carrying occupation troops from Manila Bay, Luzon to Yokohama, Japan.