USS Lyon County (LST-904) was an LST-542-class tank landing ship built for the United States Navy during World War II.

Originally laid down as USS LST-904 by the Dravo Corporation of Pittsburgh, Pennsylvania, on 12 November 1944; launched on 23 December 1944; sponsored by Miss Betty McCallen; and commissioned at New Orleans, Louisiana, on 25 January 1945.

There she embarked Army Signal Corps troops and equipment, and on 12 June steamed to the Ryukyu Islands.

Unloading completed, she embarked men of the Fifth Air Force and carried them to Yokohama, Japan, between 29 September and 4 October.

This article incorporates text from the public domain Dictionary of American Naval Fighting Ships.