Rinnou Temple is a Tendai Buddhist complex located in Nikkou, Tochigi Prefecture. It was founded by in 766 by Holy Priest Shoudou and became an attractive retreat for those seeking solitude due to its location deep in the mountains of Japan.

In 1590, during the Siege of Odawara, Toyotomi Hideyoshi seized the temple for supporting the Houjou side, causing its decline. However, during the Tokugawa Shogunate Tenkai became the chief priest of the temple and began its revival.

Many structures and artifacts within the temple are designated National Treasures or Important Cultural Properties. One of the most famous is its main building, Sanbutsudou (三仏堂) or Three Buddha Hall, so-named because it houses large gold lacquered wooden statues of Amida, Senju-Kannon ("Kannon with a thousand arms") and Bato-Kannon ("Kannon with a horse head"). The three deities are regarded as Buddhist manifestations of the three mountain deities of Nikkou enshrined at Futarasan Shrine.

The Black Gate, which is uniformly black from its pillars to its roof tiles, guards the entrance to both Sanbutsudou and the Treasure House.

The Kaizandou, or Founder's Hall, enshrines Shoudou and is located to the north of Toushou Shrine.