Stuttgart Hauptbahnhof is the primary railway station in the city of Stuttgart, the state capital of Baden-Württemberg, in southwestern Germany. It is the largest regional and long-distance railway station in Stuttgart, the main node of the Stuttgart S-Bahn network, and, together with the station at Charlottenplatz, it is the main node of the Stuttgart Stadtbahn.
Located at the northeastern end of the Königstraße, the main pedestrian zone of the city centre, the main line station is a terminus, whilst the subterranean S-Bahn and Stadtbahn stations are through-stations. The station is well known for its 12-storey tower with a large, rotating and illuminated Mercedes-Benz star insignia on top; the tower and station building are city landmarks.
Plans for the controversial Stuttgart 21 project to convert the main line terminus station into an underground through station include the demolition of the side wings of the building, together with the elimination of the platforms, tracks, and apron of the terminus station. The planned underground through station is configured at a 90-degree angle to the present station. The construction started in 2010 and is scheduled to end in 2025.