Ranastongi or Ranastøngji is a mountain on the border of Vang Municipality in Innlandet county and Hemsedal Municipality in Buskerud county, Norway. The 1900 m tall mountain is located about 12 km south of the village of Vang i Valdres and about 18 km north of the village of Trøym. The mountain is surrounded by several other notable mountains including Rankonosi and Klanten to the north, Storebotteggi to the northwest, Veslebotnskarvet to the southeast, and Blåkampen to the east.