Lengerich (; Westphalian: Lengerke) is a town in the district of Steinfurt, in North Rhine-Westphalia, Germany. It is situated on the southern slope of the Teutoburg Forest, approx. 15 km south-west of Osnabrück and 30 km north-east of Münster.
Lengerich is situated at the Wanne-Eickel-Hamburg railway and offers half-hourly connections to Münster and Osnabrück. The A1 autobahn also runs through Lengerich and the Lengerich/Tecklenburg exit is located to the west of the city.
The mayor is the pharmacist Wilhelm Möhrke (independent), the predecessor was Friedrich Prigge.
Lengerich, Westphalia is twinned with:
Lengerich's neighboring municipalities, Ladbergen and Lienen, are sister cities in the United States with Wapakoneta's neighbors New Knoxville and Saint Marys, respectively.