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

Of the agricultural land, 50.17% is used for farming or pastures, while 2.48% is used for orchards or vine crops.

Of the settled areas, 2.97% is covered with buildings, 2.15% is industrial, 0.66% is classed as special developments, and 3.96% is transportation infrastructure.

[6] Most of the population (as of 2000[update]) speaks German (89.0%), with Albanian being second most common (5.2%) and Portuguese being third (1.4%).

[7] The historical population is given in the following chart:[9][4] As of  2012[update], there were a total of 461 people employed in the municipality.

Of these, a total of 79 people worked in 29 businesses in the primary economic sector.

In the federal election, a total of 384 votes were cast, and the voter turnout was 54.9%.

[10] In the 2000 census[update] the religious membership of Gettnau was; 794 (80.2%) were Roman Catholic, and 114 (11.5%) were Protestant, with an additional 4 (0.4%) that were of some other Christian faith.

In 2014 the crime rate, of the over 200 crimes listed in the Swiss Criminal Code (running from murder, robbery and assault to accepting bribes and election fraud), in Gettnau was 32.9 per thousand residents.