Alpnach is a village in the canton of Obwalden in Switzerland . It comprises the villages of Alpnach Dorf, Alpnachstad and Schoried.

Alpnach is first mentioned about 870 as Alpenacho.

Alpnach has an area, as of 2006, of 53.8 square kilometers (20.8 sq mi). Of this area, 32.1% is used for agricultural purposes, while 54.1% is forested. Of the rest of the land, 5% is settled (buildings or roads) and the remainder (8.9%) is non-productive (rivers, glaciers or mountains).