Tuttlingen is a town in southern Baden-Württemberg, Germany. It is the capital of the district of Tuttlingen. Nendingen, Möhringen and Eßlingen are three former municipalities that belong to Tuttlingen. The district (Kreis) includes many surrounding towns including Trossingen, Spaichingen, and Mühlheim an der Donau. It is in Swabia east of the Black Forest region in the Swabian Alps.