Castle in Nagano, Japan
 is the remains of a castle structure in Sakaki, Nagano Prefecture, Japan. It is located on a 816-meter mountain. The castle was a main bastion of the Murakami clan.
In, 1553, the castle was attacked by Takeda Shingen, Murakami Yoshikiyo abandoned the castle and fled to Echigo, seeking Nagao Kagetora's help. As a result, the Battle of Kawanakajima happened.
Its ruins have been protected as a Prefectural Historic Sites. The site is now only ruins, with some stone walls, moats, and earthworks.
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