Holderburg Oßweil, Medieval castle in Oßweil, Germany.

The Holderburg at Holderstraße 14 in Oßweil began as a late-medieval three-storey stone house, a fortified dwelling with a timber-framed upper storey and a hipped gable roof. Farm buildings around it were protected by ditches and a wall; the ditches were filled in during the 19th century, suggesting a former moated layout.

The Holderburg was built around 1200 by the Counts Palatine of Tübingen, then passed to the Lords of Oßweil and by 1316 was in the hands of the Counts of Württemberg. In the 16th century it was extended and rebuilt; in the 19th century the moats were filled in. The city of Ludwigsburg bought the castle in 1977.

The name Holderburg refers to the fortified stone house at Holderstraße 14 in Oßweil, first documented in the ownership of the Counts of Württemberg in 1316. The building's core is a late-medieval three-storey stone house with a timber-framed upper floor and a hipped gable roof, later extended in the 16th century. The filled-in moats, levelled in the 19th century, are still traceable in the ground plan.

The Holderburg stands at Holderstraße 14 in the Oßweil district of Ludwigsburg, north of Stuttgart. The complex sits within the built-up area of the neighbourhood, so it is reached on foot along Oßweil's streets rather than by a trail; the moats that once ringed it were filled in during the 19th century.

The moats were filled in only in the 19th century, which is why the site is now suspected of having been a water castle. The core is a three-storey late-medieval stone house with a timber-framed upper floor and a hipped gable roof, bought by the town of Ludwigsburg in 1977.