Nördlingen (German:[ˈnœʁtlɪŋən]; Alemannic German: Nearle or Nerle) is a town in the Donau-Ries district, in Swabia, Bavaria, Germany, with a population of approximately 20,674. It is located approximately 115 km (71 mi) east of Stuttgart, and 145 km (90 mi) northwest of Munich. It was built in an impact crater 15 million years old and 25 km (16 mi) in diameter—the Nördlinger Ries—of a meteorite which hit with an estimated speed of 70,000 km/h, and left the area riddled with an estimated 72,000 tons of micro-diamonds.

Nördlingen was first mentioned in recorded history in 898. The town was the location of two battles during the Thirty Years' War, which took place between 1618 and 1648. Today it is one of very few towns in Germany that still have completely intact city walls—joining the ranks of Rothenburg ob der Tauber, Dinkelsbühl and Berching, all of them in Bavaria.

Another attraction in the town is Saint George's Church's 90-metre (300 ft) steeple, called "Daniel," which is made of a suevite impact breccia that contains shocked quartz. Other notable buildings are the town hall (which dates to the 13th century), St. Salvator church and the Spital, a former medieval hospital. The Ries crater museum is located in the well-preserved medieval tanners' quarter.

The city is home to several other museums, such as the Bavarian Railway Museum, the Nördlingen city museum (Stadtmuseum), the city wall museum (Stadtmauermuseum) and Augenblick museum. The latter has panoramas, magic lanterns, silent films, barrel organs, pianolas, music boxes, and gramophones.