Dillingen (district) (Bavarian: "Landkroas Dillingen an da Doana", Swabian: "Landchrais Dillinga an dr Donau") is a rural district in Swabia in southwest Bavaria, Germany. Neighbor districts are: Donau-Ries, Augsburg (district), Günzburg (district) and in Baden-Württemberg: Heidenheim (district); Dillingen is the capital of Dillingen (district).