Dillingen or Dillingen an der Donau is a town in Swabia, Bavaria, Germany. It is the administrative center of the district of Dillingen.
Besides the town of Dillingen proper, the municipality encompasses the villages of Donaualtheim, Fristingen, Hausen, Kicklingen, Schretzheim and Steinheim.
Schretzheim is notable for its 6th to 7th century Alemannic cemetery, 630 row graves in an area of 100 by 140 metres.