Reitnau (High Alemannic: Reitnou) is a municipality in the district of Zofingen in the canton of Aargau in Switzerland.

Following the conquest of the Aargau in 1415, the village belonged to Bern and was part of the bailiwick of Lenzburg.

[3] The church's administration was transferred in 1807 from the convent in Schänis into private hands, and was taken over in 1850 by the District.

Of the rest of the land, 0.68 km2 (0.26 sq mi) or 11.7% is settled (buildings or roads), 0.02 km2 (4.9 acres) or 0.3% is either rivers or lakes.

[4] The municipality is located in the Zofingen district, on the western edge of the Suhre river valley.

The blazon of the municipal coat of arms is Azure a Heron Argent beaked and membered Gules statant on Coupeaux Vert.

[8] The age distribution, as of 2008[update], in Reitnau is; 150 children or 12.7% of the population are between 0 and 9 years old and 164 teenagers or 13.8% are between 10 and 19.

[8] In the 2007 federal election the most popular party was the SVP which received 43.9% of the vote.

In the federal election, a total of 421 votes were cast, and the voter turnout was 49.0%.

[8] From the 2000 census[update], 196 or 17.1% were Roman Catholic, while 830 or 72.6% belonged to the Swiss Reformed Church.

Of the rest of the population, there was 1 individual who belonged to the Christian Catholic faith.