Dallenwil is a municipality in the canton of Nidwalden in Switzerland .

Dallenwil is first mentioned about 1199-1210 as Tellewilare or Telliwilare. In 1850 it was known as Thalwyl and it wasn't until 1913 that it became Dallenwil.

Dallenwil has an area, as of 2006, of 15.5 square kilometers (6.0 sq mi). Of this area, 53.7% is used for agricultural purposes, while 38% is forested. Of the rest of the land, 4.6% is settled (buildings or roads) and the remainder (3.7%) is non-productive (rivers, glaciers or mountains).