Mount Nagi (那岐山, Nagi-san), is a mountain located on the border of Chizu, Tottori Prefecture, and Nagi, Okayama Prefecture, Japan.

Mount Nagi is a typical monadnock in Chūgoku Mountain Range.

One is that this mountain is named so because Izanagi no Mikoto and Izanami no Mikoto, who are a couple of the most important gods in Japanese myth, had come down from the heaven to this mountain.

The other is because this mountain cried (naku in Japanese) when it was defeated by the height against Mount Ushiro.

There are three routes to climb up Mount Nagi; however, one of the three is closed because of the forest was destroyed by a typhoon.