Syrtbyttnosi is a mountain in Skjåk Municipality in Innlandet county, Norway. The 1700 m tall mountain is located in the Breheimen mountains and inside the Breheimen National Park, about 29 km south of the village of Grotli and about 20 km northeast of Jostedal. The mountain is surrounded by several other notable mountains including Tundradalskyrkja and Tverrådalskyrkja to the southeast, Røykjeskarhøi and Rivenoskulen to the south, and Sprongeggi and Tverreggi to the northwest.