Bockwindmühle, Post mill in Burgdorf, Germany.

The Bockwindmühle is a wooden post mill standing on a hill called Mühlenberg that rotates entirely around a central post to catch the wind. The whole structure turns to face the wind direction, rather than just the sails.

The Sorgensen post mill was built in 1686 north of Burgdorf on the road to Otze and belonged to the Welf rulers, leased by the Amt Burgdorf. The Bodenstab miller family ran it until 1882, when Friedrich Bodenstab drowned in the Burgdorfer Aue. From 1918 an hereditary rent replaced the lease, and Fritz Schwenke bought the mill that year. Milling stopped in 1960; the town of Burgdorf acquired the mill in 1985 and restored it until 1988.

The mill's name refers to Sorgensen, the village south of Burgdorf where it stands. From 1921 the miller Fritz Schwenke ran a tavern in the house beside the mill; it stayed open until 2016. The site is opened for guided tours and on the German Mill Day.

The mill is a museum mill shown on guided tours and on the German Mill Day; in 2026 the site was fenced off shortly before that day because the structure was no longer stable. The wooden post mill stands north of Burgdorf on the road to Otze, next to the red-brick motor mill built in 1948. Inside, the milling passage, the sifter and the hoist are partly preserved.

The mill's sails were renewed in 2018, not 2005. In 2026 the site was fenced off shortly before German Mill Day after damage to load-bearing parts was found during shoring work, so the mill could not be visited that year.