Bünzen is a municipality in the district of Muri in the canton of Aargau in Switzerland.

Prehistoric items have been found scattered on the banks of the former moraine, as well as Roman era objects.

[3] In 1321 Muri Abbey acquired a Meierhof farm and church rights in Bünzen from Markwart of Rüssegg.

After the conquest of the Aargau in 1415, the Swiss Confederation placed the village in the Hermetschwil district.

Today's neo-Gothic parish church building was built in 1862 at the northern exit of the village.

[4] The municipality is located in the Muri district at the foot of the Lindenberg and on moraine that stretches to the shore of the Bünz river.

The blazon of the municipal coat of arms is Argent a Beech eradicated Vert and in base a Bar wavy Azure.

[8] The age distribution, as of 2008[update], in Bünzen is; 105 children or 10.8% of the population are between 0 and 9 years old and 135 teenagers or 13.9% are between 10 and 19.

[10] About 64.6% of the total households were owner occupied, or in other words did not pay rent (though they may have a mortgage or a rent-to-own agreement).

[8] The historical population is given in the following table:[3] From the 2000 census[update], 569 or 65.8% were Roman Catholic, while 151 or 17.5% belonged to the Swiss Reformed Church.