Mt. Utsugi, Mountain summit in Nagano Prefecture, Japan.

Mount Utsugi is a 2,864 m granite summit on the main ridge of the Kiso Mountains (Central Alps), on the boundary of Komagane, Iijima and Okuwa in Nagano Prefecture. Its top is a field of large granite boulders and white gravel with a second-order triangulation point. East of the summit lies the Utsugidaira cirque, a treeless zone of creeping pine and alpine flowers.

Designated part of the Chūō Alps Prefectural Natural Park in 1951, later the Chūō Alps Quasi-National Park. When Fukada Kyūya compiled his 1964 book '100 Famous Japanese Mountains', he hesitated between Minami-Komagatake and Utsugi-dake for the southern Kiso range, choosing Utsugi for its slightly greater height and the beauty of its name.

The name Utsugi comes from the snow pattern on the summit in spring, which people in the Ina Valley below thought resembled utsugi (deutzia) blossoms; another explanation cites the many utsugi shrubs on the mountain. It was also written Utsugi-dake with different characters in older times. The saddle west of the summit, Kiso-dono-goe, is linked by legend to the warrior Kiso Yoshinaka, who is said to have crossed it in 1180; a spring on the trail there is called Yoshinaka's Power Water and can dry up in drought.

The climb is best suited for experienced hikers due to steep sections and rocky terrain that require care. A mountain hut operates during summer months and offers basic overnight accommodation, though visitors must bring their own meals and cooking gear.

The name Utsugi comes from the snow pattern on the summit in spring, which people in the Ina Valley below thought resembled the utsugi shrub; another explanation is the many utsugi trees on the mountain. The peak was once also written as Utsugi-dake with different characters.