Also known as: Tamonyama-jou (多聞山城)

A castle built by Matsunaga Hisahide, located in Nara City. It was named for Tamonten (another name for Bishamonten).

Hisahide began construction of the castle in 1560 and finished two years later. When Hisahide rebelled against Oda Nobunaga in 1573 and lost, Tamon Castle passed into the hands of Akechi Mitsuhide, then Shibata Katsuie. When Nobunaga made Tsutsui Junkei governor-general of Yamato in 1577, he ordered Tamon Castle to be torn down. Many of its stones were used in the fortification of Tsutsui Castle and Kooriyama Castle. Hisahide died the following year at Shigisan Castle.

Nothing now remains of the castle. The municiple Wakakusa Middle School stands on its former site.