Ausserberg is a municipality in the district of Raron in the canton of Valais in Switzerland .

Ausserberg is first mentioned in 1378 as Leucrun. In 1401 it was mentioned as mons episcopi and in 1523 it was mons exterior.

Ausserberg has an area, as of 2011, of 14.9 square kilometers (5.8 sq mi). Of this area, 23.8% is used for agricultural purposes, while 45.2% is forested. Of the rest of the land, 2.3% is settled (buildings or roads) and 28.7% is unproductive land.