Mount Asahi, Mountain summit in Yamagata Prefecture, Japan.

Mount Asahi is a mountain on the border of Yamagata and Niigata Prefectures in northern Japan, in the Asahi Mountain Range of Bandai-Asahi National Park. Its main peak, Ō-Asahidake, rises 1,870.3 m and lies wholly within Yamagata Prefecture; Ko-Asahidake (1,647 m) stands to the northeast and Nishi-Asahidake (1,814 m) to the northwest. The massif is a raised block of mostly Paleozoic granite, heavily eroded, with a rounded summit and long ridges.

The mountain gained attention through its inclusion in Kyūya Fukada's list of Japan's 100 notable mountains. This publication helped bring recognition to the summit among climbers and nature enthusiasts.

Mount Asahi gives its name to the Asahi Mountain Range (Asahi Renpō), and the massif's main summit, Ō-Asahidake, is listed in Kyūya Fukada's book 100 Famous Japanese Mountains. The range lies within Bandai-Asahi National Park, together with Dewa Sanzan to the north and the Iide Range to the south. Two hot springs, Kodera Kōsen and Asahi Kōsen, serve as trailheads for climbers.

Multiple trails reach the summit, with the main route starting from the eastern side offering the most straightforward access. Visitors should prepare for mountain conditions and bring appropriate gear.

The mountain features three distinct peaks at different elevations: Ō-Asahidake at 1,870 meters, Nishi-Asahidake at 1,814 meters, and Ko-Asahidake at 1,648 meters. This variety gives hikers the chance to visit multiple summits during a single journey.