Ahaus

• Type — Stadt • Name — Ahaus • Image Photo — Ahaus Georgsbrunnen.jpg • Image Caption — St George's Fountain in Ahaus • Image Coa — DEU Ahaus COA.svg • Image Plan — Ahaus in BOR.svg • State — Nordrhein-Westfalen • Region — Münster • District — Borken • Elevation — 36 - 70 • Area — 151.24 • Postal Code — 48683 • Area Code — 02561, 02567 • Licence — BOR, AH, BOH • Gemeindeschlussel — 05 5 54 004 • Divisions — 6 • Website — www.ahaus.de • Mayor — Karola Voß • Leader Term — 2025–30 • Party — Independent Ahaus (De-Ahaus.ogg; Westphalian: Ausen) is a town in the district of Borken in the state of North Rhine-Westphalia, Germany. It is located near the border with the Netherlands, lying some 20 km south-east of Enschede and 15 km south from Gronau. Ahaus is the location of one of Germany's interim storage facilities for radioactive spent fuel.

The first written mention of the aristocratic seat of Haus an der Aa dates from around 1030. Around 1120, Bernhard von Diepenheim commissioned the construction of the predecessor to the present-day Ahaus Castle. In 1154, his son Lifhard called himself von Ahaus for the first time. The lords of Ahaus belonged to the smaller noble dynasties in Westphalia in the wider environment of the Munster bishops. They got into a fight with them in 1176 when the nobleman Johann von Ahaus gave his castle as a fief to the Archbishop of Cologne. In 1177, however, John had to surrender to Prince Bishop Hermann II of Münster. The castles of Ahaus and Diepenheim, which belonged to the noble lords of Ahaus, were destroyed. Nevertheless, the noble lords remained in possession of their rule. In 1389 the noble lords of Ahaus granted the castle settlement an excise privilege. Two years later, Ahaus received city rights. In 1406, the Prince-Bishop of Münster, Otto IV von Hoya, bought the lordship of Ahaus and incorporated it into the Bishopric of Münster. It was combined by the Bishopric of Münster together with 24 parishes, which extended over large parts of West Münsterland, to form the Amt of Ahaus. It lasted until it was dissolved by the Reichsdeputationshauptschluss in 1803.

The current mayor is Karola Voß who has been serving as mayor since 2015. In the 2025 local elections she was reelected with 90% of the votes.

Ahaus has an oceanic climate (Köppen: Cfb; Trewartha: Dobk).

Ahaus is twinned with: • Argentré-du-Plessis, France • Haaksbergen, Netherlands

• Friedrich Koechling (1893–1970), officer, general of infantry • Michael Denhoff (born 1955), composer and cellist • Jens Spahn (born 1980), politician (CDU), Member of Bundestag • Heike Wermer (born 1988), CDU politician • Urszula Radwańska (born 1990), Polish tennis player • Stefan Thesker (born 1991), footballer

Ahaus is located in the Dortmund–Gronau railway and in the area of the fare association Westfalen-Tarif.