Saimyō-ji (西明寺), also known as Kotō-sanzan Saimyōji (湖東三山西明寺) or as Ryūōzan Saimyōji (龍應山西明寺) is a Buddhist temple of the Tendai sect located in the town of Kōra, Shiga Prefecture, Japan. The honzon of the temple is Yakushi Nyōrai, the Buddha of healing. The temple was founded in the early Heian period and together with Kongōrin-ji in Aishō and Hyakusai-ji in Higashiōmi the temple forms a group of three temples known as Kotō-sanzan . The complex includes several National Treasures and a garden designated as National Place of Scenic Beauty.

Kōra is a town located in Shiga Prefecture, Japan. As of 1 August 2021, the town had an estimated population of 6,721 in 2619 households and a population density of 490 persons per km². The total area of the town is 13.63 square kilometres (5.26 sq mi).