Iserlohn (German: [iːzɐˈloːn] ⓘ; Westphalian: Iserlaun) is a city in the Märkischer Kreis district, in North Rhine-Westphalia, Germany.

The Pancratius church (also called Bauernkirche) is believed to have been founded in around 985, but the first written document mentioning lon dates only from 1150.

The most recent city council election was held on 13 September 2020, and the results were as follows: The Dechenhöhle caves were discovered in 1868 during the construction of the railway line Hagen-Iserlohn.

The Danzturm, located on the southern hill overlooking the old city, is a landmark and featured on the logo of the local brewery (Iserlohner).

The headquarters, together with a major branch, of the South Westphalia University of Applied Sciences (also: Fachhochschule Südwestfalen (FH SWF)) offering engineering and informatics programmes is located in the city centre on Alexanderhöhe.

[5] The Schützenfest is a famous festival which takes place every year, and is central to Iserlohner's cultural life - and the town's identity.