Burg Unna, Medieval castle in Unna, Germany.

Burg Unna is a medieval fortress in Unna featuring thick stone walls, defensive towers, and fortification elements from the 14th century. The structure demonstrates typical features of German military architecture from that era with well-maintained construction.

Burg Unna was reportedly built in 1380 by Count Engelbert III von der Mark, though its origins may reach back to the late 13th century, when Unna was first surrounded by a town wall. In 1405 it was sold to the knight Hermann von der Recke. Later owners included the von Sprenge family, mayor Winold von Büren around 1600, and the manufacturer Müller, who sold the so-called Hof zur Küche to the town of Unna in 1929; since 1936 it has housed the Hellwegmuseum.

The building is known as Hof zur Küche in 17th- and 18th-century records. Since 1936 it has housed the Hellwegmuseum, a local history museum founded as a counter-movement to increasing mechanisation. Its displays cover prehistory, the Middle Ages and the industrialisation of the Hellweg region, with changing special exhibitions.

Burg Unna stands at Burgstr. 8 on the northeastern stretch of Unna's town wall, and the building is used as the Hellwegmuseum. The museum displays cover prehistory, the Middle Ages and the industrialisation of the Hellweg region, with changing special exhibitions. The oldest section is the south wing from the 16th century; the west wing was added around 1890.

The round four-storey defensive tower in the southwest corner has an interior diameter of 2.50 m and walls 2.10 m thick. Its lower storeys and three cellar rooms are medieval, while the upper floors date from the end of the 19th century.