Wiedenborstel is a municipality in the district of Steinburg, in Schleswig-Holstein, Germany.

The village is located approximately 12 km north of Kellinghusen, and 10 km west of Neumünster, in the middle of Aukrug Nature Park. Hamburg is 75 km south.

Wiedenborstel was the least populated municipality in Germany as of 31 March 2010 with only eight inhabitants. All of the inhabitants belong to the same family. In 1910, Wiedenborstel had 119 inhabitants. Officially, by 31 December 2012, there were twelve inhabitants. It was no longer the least populous municipality in Germany, having lost that distinction to Gröde (with eleven inhabitants), and tied with Dierfeld (also with twelve). It was still the least densely populated municipality in Germany as of that date.

Media related to Wiedenborstel at Wikimedia Commons

• (in German) Official site of Amt Kellinghusen