Neuaigen castle, Renaissance castle in Tulln an der Donau, Austria.

Neuaigen is a Renaissance castle in Tulln an der Donau featuring a two-story main block with a square gatehouse on its southern face. Two side wings with arcaded galleries frame a central courtyard where the architecture shows careful attention to proportioned design.

A predecessor building was erected at the end of the 15th century by Laurenz Freiherr von Hofkirchen. The present castle was probably built at the beginning of the 17th century, likely by Georg Andre von Hofkirchen. In 1620 Emperor Ferdinand II confiscated the estates and lordship; the property passed through several owners, reaching the counts Breuner-Enkevoerth in 1746 by marriage.

The name Neuaigen refers to the village around the castle, which lies on the main road at its western edge. The garden holds stone sculptures of allegories and gods on pedestals, and four sandstone busts on volute pedestals from the mid-18th century stand before the south facade, brought here from Schloss Harmannsdorf am Manhartsberg.

The castle stands on the through road at the western edge of Neuaigen, in the municipality of Tulln an der Donau, and is a protected monument. It is privately owned, so access to the interior is not guaranteed; the gate tower, side projections and the long avenue on the axis of the main facade can be seen from the public road.

Four sandstone busts on volute pedestals stand before the south facade; they date from the mid-18th century and were moved here from Schloss Harmannsdorf am Manhartsberg. The garden also holds stone sculptures on pedestals depicting allegories and gods.