Sigmaringen is a city in southern Germany, in the state of Baden-Württemberg, at the upper Danube, formerly Hohenzollern, capital of the Sigmaringen district.

Sigmaringen is a district (Kreis) in the south of Baden-Württemberg, Germany. Neighboring districts are (from north clockwise) Reutlingen, Biberach, Ravensburg, Bodensee, Constance and Zollernalbkreis.