Sagiyama Castle (鷺山城, Sagiyama-jō) was a castle built in Mino Province in middle Japan during the late-Heian period (late 12th century); it was destroyed during the Sengoku period in the mid-16th century.

Because the castle was built as a residence and not a defensive fortress, its location on a small mountain was of little consequence.

It served as a main castle for the Toki clan, who were the shugo of Mino Province at the time, at first.

Dōsan gave possession of Sagiyama Castle to his son, Saitō Yoshitatsu, in 1548 after some repairs.

In 1964, during the construction of the Tōkaidō Shinkansen and the Meishin Expressway, dirt and stones from Mount Sagi were used, reducing the size of the mountain.