Tanzawa-Ōyama Quasi-National Park (丹沢大山国定公園, Tanzawa-Ōyama Kokutei Kōen) is a quasi-national park in the Kantō region of Honshū in Japan.

[2] The park includes the Tanzawa Mountains, Miyagase Dam and its surrounding forests, Hayato Great Falls, and the religious sites of Mount Ōyama in the mountains of western Kanagawa Prefecture.

The central portion of this area was further designated a quasi-national park on March 25, 1965.

[1] The park spans the borders of the municipalities of Atsugi, Hadano, Isehara, Kiyokawa, Matsuda, Sagamihara, and Yamakita.

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