Burg Dasburg, Medieval castle ruin in Dasburg, Germany

Burg Dasburg is a castle ruin situated on a hilltop in Dasburg, with visible wall foundations and a well-preserved round tower still standing. The remaining structures of both inner and outer sections show how the fortification once protected the area.

The castle was probably built around 850 as a refuge for the monks of Prüm Abbey and was first recorded in 1222 as "Daysberhc castrum" in a commentary on the Prüm Urbar. It was held as a fief by the counts of Vianden, later passing to Nassau-Dillenburg in 1417 and to Nassau-Oranien in 1604. In 1794 French revolutionary troops occupied the region, and in 1813 General Oudinot, who had received the castle from Napoleon, had it auctioned by notary Dupont.

The Dutch royal title still includes the designation linked to Dasburg: the Dutch monarch bears the addition "Heer van Dasburg" (Lord of Dasburg). The castle and lordship were held as a fief from Prümer Abbey by the counts of Vianden, and later passed through the houses of Sponheim, Nassau and Orange, which explains this title. Pastor Jakob Pott listed 35 houses in Dasburg by name in 1625.

The ruin is accessible to visitors and provides views of the surrounding landscape from the hilltop. Well-maintained paths lead to the visible structures, though the terrain can be uneven and sturdy footwear is advisable.

On 22 January 2012, large sections of the outer masonry and the foundations of the round tower broke away and slid down towards the B 410 road below. The ruin has been owned by the state of Rhineland-Palatinate since 1945 and was placed under the state palace administration in 1965; it is currently being restored and is to be leased out afterwards.