Renchaku-ji, Buddhist temple in Ito, Japan

Renchaku-ji is a Hokke-shū Jimmon-ryū temple in Itō, Shizuoka Prefecture, founded in 1508 by Shōjō-in Nichiun. Its precinct covers about 210,000 tsubo and includes the main hall, the offshore Sogan rock linked to Nichiren's exile, and a 15-meter mokuyō myrica designated a national natural monument.

Nichiren, founder of the Hokke school, was exiled to Ito in 1261 after criticising the Kamakura shogunate; tradition holds he was left on the offshore Soganiwa rock at Uzaki, rescued by a fisherman named Yasaburo, and stayed until his pardon in 1263. The temple itself was founded in 1508 by Shojō-in Nichiun as a reijō betsuin of the Hokke-shū Jinmon-ryū.

Renchaku-ji belongs to the Hokke (Lotus) school, Jinnon-ryu branch, as a reijo betsuin, a sacred-site branch temple. Its name links the lotus of the Lotus Sutra to the landing place of Nichiren, who according to temple tradition was rescued here by the fisherman Misaburo. The temple's mountain name is Soganzan, after the Sogan rock offshore.

The temple is accessible by local buses from Ito Station, with regular service to stops near the entrance throughout the day. Daytime visits allow better viewing of the architectural details and garden features.

The temple grounds cover about 210,000 tsubo, and within them stands a yamamomo (Chinese bayberry) tree 15 m tall with a trunk circumference of 7.2 m, its branches reaching 22 m east-west and 18 m north-south. It is designated a National Natural Monument as the largest of its kind in Japan.