Ōya-dera (大谷寺), also called Oya Kannon, is a Tendai Buddhist temple in Utsunomiya, Tochigi Prefecture. It is known for its cliff-face bas-relief carvings and its main image, a statue of Senjū Kannon Bosatsu. The temple’s formal name is Tenkai-zan Jodo-in Ōya-ji (天開山 浄土院 大谷寺). The temple dates to the Heian period and became established as a worship site at the Oya stone quarry area. Its setting links Buddhist practice with local stone-cutting history, and the site is protected as an important cultural property. Ōya-dera is the 19th stop on the Bandō Sanjūsankasho pilgrimage route, a major Kannon pilgrimage in the Kantō region. This gives the temple religious importance beyond Utsunomiya, especially for visitors following the 33-temple circuit.