Abensberg, used to be a spa town in Germany, in Bavaria, on the Abens, a tributary of the Danube, 18 m. S.W. of Regensburg, with which it is connected by rail and motorway (A93). Pop. (2004) about 12500. It has a small spa, and its sulphur baths are resorted to for the cure of rheumatism and gout. The water is not used any more. The town is the Castra Abusina of the Romans, and Roman remains exist in the neighbourhood. Here, on the 20th of April 1809, Napoleon gained a signal victory over the Austrians under the Archduke Louis and General Hiller.

Abensberg is the birthplace of Johannes Aventinus.