Mount Tomuraushi (トムラウシ山, Tomuraushi-san) is located in Daisetsuzan National Park, Hokkaidō, Japan.

The peak of Mount Tomuraushi consists of mainly non-alkalai mafic rock from the Pleistocene to the Holocene.

[2] On July 16, 2009, eight members of an adventure tour group on a 4-day hiking trek died of hypothermia in bad weather on Mount Tomuraushi.

The victims were believed to have exhausted themselves in strong winds and rain in an area with few mountain lodges.

Police investigated the possibility of professional negligence of the climbing tour operators and guides leading to the deaths.