Langvasshøi is a mountain in Lom Municipality in Innlandet county, Norway. The 2030 m tall mountain is located in the Jotunheimen mountains within Jotunheimen National Park. The mountain sits about 35 km south of the village of Fossbergom and about 37 km northeast of the village of Øvre Årdal. The mountain is surrounded by several other notable mountains including Urdadalstindene, Visbretinden, and Semelholstinden to the northeast; Semeltinden to the southeast; Skarddalstinden and Skarddalseggi o to the south; Høgvagltindene to the southwest; Kyrkja and Kyrkjeoksli to the northwest; and Tverrbytthornet to the north.