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

The earliest trace of human settlement near Geltwil is a Roman era villa.

In the center is the school house was built in 1972 and the memorial to the battle that took place during the Sonderbund war in Geltwil in 1847.

In 1942, the municipality refused to bow to Axis pressure and introduce Daylight saving time.

[4] The municipality is located in the Muri district on the eastern slope of the Lindenberg.

The blazon of the municipal coat of arms is Gules a Bath-Tub Or and in chief a Coin of the same bearing a Cross recercelée Sable and Coupeaux Vert.

[8] The age distribution, as of 2008[update], in Geltwil is; 27 children or 14.1% of the population are between 0 and 9 years old and 33 teenagers or 17.2% are between 10 and 19.

[10] About 71.4% 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] The house at Isenbergschwilerstrasse 37 is listed as a Swiss heritage site of national significance.

[8] From the 2000 census[update], 95 or 69.3% were Roman Catholic, while 21 or 15.3% belonged to the Swiss Reformed Church.