The second Battle of Nördlingen was fought on August 3, 1645 southeast of Nördlingen near the village of Alerheim. France and its Protestant German allies defeated the forces of the Holy Roman Empire and its Bavarian ally.

Nördlingen 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 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.