Aschaffenburg (German pronunciation:[aˈʃafənbʊɐ̯k]) is a city in northwest Bavaria, Germany. The town of Aschaffenburg is not considered part of the district of Aschaffenburg, but is the administrative seat.

Aschaffenburg belonged to the Archbishopric of Mainz for more than 800 years. The city is located at the westernmost border of Lower Franconia and separated from the central and eastern part of the administrative district by the Spessart hills, whereas it opens towards the Rhine-Main plain in the west and north-west. Therefore, the inhabitants speak neither Bavarian nor East Franconian but rather a local version of Rhine Franconian.