Martisberg is a former municipality in the district of Raron in the canton of Valais in Switzerland . On 1 January 2014 the former municipalities of Martisberg and Betten merged into the new municipality of Bettmeralp .

Martisberg is first mentioned in 1311 as Martisperg.

Before the merger, Martisberg had a total area of 3.0 km2 (1.2 sq mi). Of this area, 42.2% is used for agricultural purposes, while 41.2% is forested. Of the rest of the land, 3.7% is settled (buildings or roads) and 13.0% is unproductive land.