Mōtsū-ji (毛越寺) is a Buddhist temple of the Tendai sect in the town of Hiraizumi in southern Iwate Prefecture, Japan, and also refers to the historic area surrounding it containing the ruins of two older temples, Enryū-ji (圓隆寺) and Kashō-ji (嘉祥寺) in a Jōdo (Pure Land) garden.

If so, it is supposed that this original temple was consumed by fire soon after its completion in the war of succession between Motohira and his brother Koretsune.

At the height of its glory Mōtsū-ji is said to have had 40 buildings and up to 500 subsidiary chapels for meditation, many of which used rare woods and precious materials in their construction, in the manner of nearby Chūson-ji.

Kashō-ji also contained a monumental statue of Yakushi Nyōrai but the walls were decorated with paintings illustrating the Lotus Sutra.

After the downfall of the Northern Fujiwara clan, all of the buildings were destroyed by fires, either natural or in conflicts, and the temple was completely in ruins by 1226.

In the original garden, bridges connected this hall with the central island (which was shaped like a magatama) and the great south gate.