Mount Tanigawa, Mountain on the Gunma–Niigata border, Japan

Mount Tanigawa is a 1,977 m twin-peaked mountain on the border of Gunma and Niigata prefectures, in the Mikuni range of the Echigo Mountains, not the Japanese Alps. Its two summits are Toma-no-Mimi (1,963 m) and Oki-no-Mimi (1,977 m); the upper slopes are basalt and serpentinite, the lower slopes granite.

The peak became known to climbers especially from the 1930s onward and quickly attracted alpinists due to its steep walls. Because of many accidents the authorities later introduced safety measures and monitoring systems.

The two summits are named Toma-no-Mimi and Oki-no-Mimi, from words for the near entrance and the far inner part, because the pair of peaks seen from the Tone and Numata side resembles two ears. Toma-no-Mimi also carries the name Yakushi-dake, from a Yakushi Nyorai image once worshipped there. A shrine to Asama stands at Oki-no-Mimi's northern side, and its spring festival on 29 April features a kagura dance.

A cable car brings visitors within minutes from the valley up to a midway station and shortens the ascent considerably. Weather conditions can change very quickly and require warm clothing as well as some experience in dealing with alpine terrain.

The peak sits where continental air masses meet moist currents from the Pacific and thereby produces extreme snow amounts in winter. The drifts sometimes form overhangs of snow that extend several meters beyond the rock edge.