Sæbyggjenuten is a mountain on the border of Aust-Agder and Telemark counties in southern Norway. The tall mountain is the highest point in Bykle municipality as well as for all of Aust-Agder county, and in the whole region of Southern Norway (Sørlandet). The mountain sits on the border of the municipalities of Bykle (in Aust-Agder county) and Tokke (in Telemark county). It is located about west of Dalen in Telemark and also about northeast of the village of Bykle in Aust-Agder.