Mount Ōyama, also Mount Afuri or Mount Kunimi, is a 1,252-metre-high mountain situated on the border of Isehara, Hadano and Atsugi in Kanagawa Prefecture, Japan. Together with Mount Tanzawa and other mountains in the Tanzawa Mountains it forms the Tanzawa-Ōyama Quasi-National Park. Mount Ōyama is a popular sightseeing spot in Kanagawa Prefecture.