Korneuburg (German pronunciation: [kɔʁˈnɔʏbʊʁk] ⓘ; Central Bavarian: Korneibuag) is a town in Austria.

It is located in the state Lower Austria and is the administrative center of the district of Korneuburg.

Korneuburg is situated on the left bank of the Danube, opposite the city of Klosterneuburg, and is 12 km northwest of Vienna.

It was frequently involved in the conflict between the Hungarian king Matthias Corvinus and the emperor Frederick III.

The Korneuburg Shipyard is now the site of a branch of the Museum of Military History, Vienna comprising two patrol boats, Niederösterreich and Oberst Brecht.