The Ulm–Sigmaringen railway is a 92.670-kilometre-long railway in Baden-Württemberg in south-western Germany, which is largely single-tracked and for the most part not electrified. It runs from Ulm via Blaubeuren and Riedlingen to Sigmaringen mostly in the valley of the Danube. The line is part of the once important long-distance connection from Munich to Freiburg im Breisgau.