Kannon-ji, Buddhist temple in Maibara, Japan.

Kannon-ji is a Buddhist temple at the base of a mountain in Shiga Prefecture, featuring a main hall, sanctuary gate, and bell tower. The buildings and grounds form a connected complex where visitors can move through and explore each structure.

Founded during the Ninju era (851–854) by Sanshū, Kannon-ji originally belonged to the Hossō school as one of the four great guardian temples of Mount Ibuki. In 1383 it was converted to the Tendai school. It is known for Toyotomi Hideyoshi discovering Ishida Mitsunari, then a temple boy, through the "three bowls of tea" episode.

The temple is commonly called Ōhara Kannon-ji, after its location in the Ōhara area of Maibara. Its main image is the Eleven-Faced Thousand-Armed Kannon, and the temple belongs to the Tendai school. Near the pond west of the main gate stands the well where, by tradition, water was drawn for the tea that Ishida Mitsunari served Toyotomi Hideyoshi.

The temple stands in the Ōhara district of Maibara, Shiga Prefecture, and its precinct is entered through the Sōmon gate, with the main hall and bell tower inside. The pond beside the Sōmon, west of the gate, holds the well linked to the tea Ishida Mitsunari is said to have served. The temple is reached on foot within the grounds.

The temple is known for the story of Toyotomi Hideyoshi, then lord of Nagahama Castle, stopping here on a falconry trip and noticing the boy Ishida Mitsunari, a temple acolyte, through his quick answers to three cups of tea. A well by the pond west of the outer gate is said to have supplied that tea water.