Langnau im Emmental is a municipality in the administrative district of Emmental in the canton of Bern in Switzerland. It is situated in the upper Emmental between Bern and Lucerne. There are no signs of human inhabitants before the German migration in about the 11th century. The first mention of the name Langnau (German lange Au or Lanngnouw meaning long pasture/meadow) dates to 1139. In 1246 it was mentioned as Langenowe.