Tverrbytthornet is a mountain in Lom Municipality in Innlandet county, Norway. The 2103 m tall mountain is located in the Jotunheimen mountains within Jotunheimen National Park. The mountain sits about 34 km southwest of the village of Fossbergom and about 40 km northeast of the village of Øvre Årdal. The mountain is surrounded by several other notable mountains including Kyrkja and Kyrkjeoksli to the south; Tverrbottindene to the northwest; Store Bukkeholstinden to the north; Bukkeholshøi to the northeast; Nørdre Hellstugutinden to the east; and Urdadalstindene, Semelholstinden, and Visbretinden to the southeast.