Grotbreahesten is a mountain in Lom Municipality in Innlandet county, Norway. The 2013 m tall mountain is located in the Jotunheimen mountains within Jotunheimen National Park. The mountain sits about 18 km south of the village of Fossbergom and about 36 km southwest of the village of Vågåmo. The mountain is surrounded by several other notable mountains including Finnshalspiggen and Nørdre Trollsteinhøe to the north, Smådalshøe to the northeast, Trollsteineggi and Glittertinden to the south, Trollsteinrundhøe to the west, and Gråhøe and Svartholshøe to the northwest.