Unterallgäu is a rural district in Swabia in southwest Bavaria, Germany. Neighbor districts are: Neu-Ulm (district), Günzburg (district), Augsburg (district), Ostallgäu and Oberallgäu and in Baden-Württemberg: Ravensburg (district) and Biberach (district); West of the district is the Bavarian district-free city Memmingen. Mindelheim is the capital of the Unterallgäu.