Stornubben is a mountain on the border of Vågå Municipality and Lom Municipality in Innlandet county, Norway. The 2174 m tall mountain is located in the Jotunheimen mountains within Jotunheimen National Park. The mountain sits about 32 km southwest of the village of Vågåmo. The mountain is surrounded by several other notable mountains including Hindnubben to the northeast, Heranoshøi to the north, Glittertinden to the northwest, Nautgardstinden and Nautgardsoksli to the southwest, and Russlirundhøe to the south.