Koshu-ji, Buddhist temple in Minami-ku, Fukuoka, Japan

Koshu-ji is a Buddhist temple in Fukuoka featuring traditional Soto Zen architecture with its main hall positioned beneath a natural rock cavern. The compound contains several buildings and monuments arranged across its grounds.

Founded in 1693, the temple was established when priest Tando Chozen relocated the community from its original location in Kumade Village. The move followed the earlier destruction of the temple at its first site.

The temple is also called Kōshū-zenji and Anakannon, after the Kannon image carved inside the cave. Each year on December 14, the date of the raid, the Fukuoka Gishi Festival is held here at the replica graves of the Forty-Seven Rōnin.

The temple grounds sit below the Takamiya rock cavern in the Terazuka district of Minami-ku. A stone stairway links the temple to the Anakannon cave, and the hill path is uneven, so sturdy shoes help. The cave and the replica graves lie on the hillside south of the main hall.

In 1935 the private investor Zenjirō Kihara paid for replicas of the graves of the Forty-Seven Rōnin, built in the same style as the originals at Sengaku-ji in Tokyo. He intended them for the health development of youth and the promotion of national consciousness. Each year on 14 December, the date of the raid, the temple holds the Fukuoka Gishi Festival.