| Ontake Prefectural Natural Park | |
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| 御岳県立自然公園 | |
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| Location | Nagano Prefecture, Japan |
| Area | 190.46 km2 |
| Established | 3 March 1952 |
Ontake Prefectural Natural Park (御岳県立自然公園 Ontake kenritsu shizen kōen?) is a Prefectural Natural Park in western Nagano Prefecture, Japan. Established in 1952, the park's central feature is Mount Ontake. The park spans the borders of the municipalities of Kiso and Ōtaki.