The Kinzan Kōzan-ji (金山功山寺) is a temple of the Sōtō school of Zen faction in Shimonoseki, Yamaguchi Prefecture, Japan.

It was first established as a temple of the Rinzai school by Kyoan Genjaku in 1327 of the late Kamakura era.

Kōzan-ji's Butsuden, completed in 1320, is a National Treasure of Japan.

It is the oldest building designed in the Zenshūyō style that exists in Japan.

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