Klosterneuburg (German pronunciation: [kloːstɐˈnɔɪ̯bʊʁk] ⓘ), frequently abbreviated to Kloburg[3] by locals, is a town in the Tulln District of the Austrian state of Lower Austria.

The town is tightly linked to the Austrian capital and is thought to house some of Lower Austria's most affluent citizens [citation needed].

In the Roman era (1st to 5th centuries), a fort of the Danubian limes stood at the site of Klosterneuburg on the northwestern border of the Pannonia.

In 1114 Leopold, son-in-law of the Salian emperor Henry IV by his marriage with Agnes of Wailingen, had a princely castle erected together with a collegiate church on a hill rising directly from the banks of the Danube,[4] which he transferred to Augustinian canons in 1133.

This order is one of the oldest and richest of its kind in Austria; it owned much of the land upon which today the north-western suburbs of Vienna stand.

The monastery complex include the old chapel of 1318, with Leopold's tomb and the Verdun Altar, dating from the 12th century, the treasury and relic-chamber, the library with 30,000 volumes and numerous manuscripts, the picture gallery, the collection of coins, the theological hall, and the winecellar, containing an immense tun like that at Heidelberg.

In the 18th century Emperor Charles VI, who could not prevail in the War of the Spanish Succession, set up plans to rebuild the Klosterneuburg monastery complex modelled on the Escorial.

A winemaker's town during the 19th century, Klosterneuburg developed to a recreational and residential area of Austrian officials working in the nearby capital.