Kōzan-ji (高山寺), officially Toganōsan Kōsan-ji (栂尾山高山寺), is a Buddhist temple of the Omuro sect of Shingon Buddhism in Umegahata Toganōchō, Ukyō Ward, Kyoto, Japan.

The temple was founded by the Shingon scholar and monk Myōe (1173–1232) and is renowned for its numerous national treasures and important cultural properties.

In 1206, Myōe, a Kegon Buddhist priest who had been serving at nearby Jingo-ji, was granted the land to construct a temple by Emperor Go-Toba.

The temple's name was taken from a line in the Avatamsaka sutra: "When the sun appears, it first casts its light upon the highest mountain."

A large number of buildings, picture scrolls, carvings, furnishings and old writings have been registered as important cultural properties.