Mount Nyū (乳, Nyū) is a stratovolcano of the Northern Yatsugatake Volcanic Group in Koumi, Nagano Prefecture, Japan. This mountain is part of the Yatsugatake-Chūshin Kōgen Quasi-National Park.

There are several routes to reach to the top of Mount Nyū. One is from Shirokoma Pond, it takes one and half hours. Another major route is from Mount Naka.

• Shirokomaike-iriguchi Bus Stop of Chikuma Bus
• Mugikusa-toge Bus Stop of Chikuma Bus

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  Mount Nyū and Mount Naka.
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  Mount Tateshina, Mount Kitayoko and Shirokoma Pond from Mount Nyū
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  Mount Iō from Mount Nyū
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  East side view from the top of Mount Nyū
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  Southeast side view the top of Mount Nyū
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  At the route to Mount Nyū (1)
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  At the route to Mount Nyū (2)
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  Shirakoma Moor on the way to Mount Nyū

• Ministry of Environment of Japan (Japanese)
• Official Home Page of the Geographical Survey Institute in Japan (Japanese)