is a yamashiro, or mountain castle, located on Hachiman Mountain in Gujō, Gifu Prefecture, Japan.
Gujō Hachiman Castle was built in 1559
by Endō Morikazu
(遠藤盛数). Morikazu had barely finished the castle when he died, leaving it to his son Endō Yoshitaka
. Yoshitaka later became a retainer to Oda Nobunaga
and the direct control of the castle fell into the hands of Inaba Sadamichi
, who renovated much of the castle. Yoshitaka returned to rule the castle following the Battle of Sekigahara
. The castle was expanded following Tsunetomo's appointment to the castle in 1646
. In 1870
, during the Meiji Restoration, the castle was torn down during Japan's attempts to modernize. In 1933
, it was reconstructed out of wood.