Menznau is a municipality in the district of Willisau in the canton of Lucerne in Switzerland.

[3] On February 27, 2013, a gunman opened fire in a Kronospan wood-processing plant, killing four.

Of the rest of the land, 5.4% is settled (buildings or roads) and the remainder (0.6%) is non-productive (rivers, glaciers or mountains).

Of the settled areas, 2.3% is covered with buildings, 0.62% is industrial, 0.33% is classed as special developments, 0.13% is parks or greenbelts and 2.01% is transportation infrastructure.

Most of the population (as of 2000[update]) speaks German (94.0%), with Albanian being second most common ( 2.9%) and Serbo-Croatian being third ( 1.3%).

The age distribution, as of 2008[update], in Menznau is; 767 people or 27.7% of the population is 0–19 years old.

In the 2000 census[update] the religious membership of Menznau was; 2,389 (83.8%) were Roman Catholic, and 212 (7.4%) were Protestant, with an additional 13 (0.46%) that were of some other Christian faith.