Kaichō-ji, Buddhist temple in Shimizu-ku, Japan.

Kaichō-ji is a Nichiren-shū temple in Muramatsu, Shimizu-ku, Shizuoka, with the mountain name Ryūsuizan. Its halls were rebuilt after fires in 1921 and 1945; the bell tower and treasure storehouse survived the 1945 air raid. The main hall houses a wish-fulfilling founder statue by the monk Nichihō.

Founded in 852 as Gagaku-ji on Mount Arido, the temple was destroyed by a tsunami in 1011 and moved to its present site. In 1274 the monk Nichii converted its abbot and it became Kaijō-ji on Mount Ryūsui. It suffered repeated natural disasters, was renamed Kaichō-ji in the Edo period, and burned down entirely in 1921 and again in the 1945 Shimizu air raid, leaving only the bell tower and treasury.

The temple belongs to the Nichiren school and is one of the five head temples of the Ikegami lineage. Its name was changed from Kaijō-ji to Kaichō-ji during the Edo period. The main hall houses a statue of the founder made by the priest Nichihō, and a Tenjin statue brought from Tang China is kept in the Tenjin hall.

The temple stands in Muramatsu, Shimizu-ku, Shizuoka; from Shimizu Station on the Tōkaidō Main Line take a bus and get off at Muramatsu, then walk about three minutes. The grounds were rebuilt after fires in 1921 and 1945, so the bell tower and treasure store are among the older surviving structures.

The temple's name is not related to the kaichō displays of hidden treasures. It was founded in 852 as Gagaku-ji, became Kaijō-ji in 1274 when the monk Nichii converted its abbot, and only in the Edo period was it renamed Kaichō-ji. Its hillside site dates from 1011, after a tsunami destroyed the original.