Burg Hausfreden, Medieval castle ruin in Freden, Germany.

Burg Hausfreden is a medieval castle ruin located in Freden on elevated terrain, with stone walls and foundations that reveal the layout of the original fortress. The preserved remains display the defensive design of the structure and how it was organized.

The Lords of Freden built the castle around 1344 after the Bishop of Hildesheim granted them the right to fortify. In 1382 they sold half to the Welfs, who pledged it to the Lords of Wettberg; from 1400 the Lords of Reden used it as a base for highway robbery. In May 1402 an alliance of the bishop, Welf dukes and cities besieged it with 2,000 men and the Göttingen gun "Grote Busse"; the castle was taken and demolished, never rebuilt.

The name Hausfreden ties the ruin to the lords of Freden, who were enfeoffed with the village by the Hildesheim bishop in 1344 and farmed a domain a few hundred metres southeast of the castle site that still exists today. Local legend holds that during the 1402 siege the defenders sortied and escaped after a cannon burst.

The site is accessible via marked hiking paths from Freden's town center and features informational panels throughout the area. Wearing sturdy footwear is recommended since the terrain is uneven and the ground is natural earth and stone.

The 1962 excavation found pottery sherds, an iron ring and an iron spur, all matching the 14th-century date known from records. The site also preserves a deep section ditch cut into the bedrock, separating the plateau from the ridge behind it.