Storheddernuten or Storhidlernuten (historic: Storhellernuten) is a mountain on the border of Agder and Rogaland counties in southern Norway. The 1402 m tall mountain has a topographic prominence of 70 m. The mountain sits on the border of the municipalities of Suldal in Rogaland and Bykle in Agder. The mountain is the 21st highest mountain in Agder county. The mountain sits near the northernmost point in Agder county, just south of the lake Holmavatnet. The mountain Skyvassnuten and the lake Skyvatn lie just a few kilometers south of this mountain. There is road access from the village of Nesflaten in Suldal located about 20 km to the west.