The Rosenstein tunnel (German: Rosensteintunnel) is the name of several past, present and planned tunnels in the Stuttgart metropolitan area, in the German state of Baden-Württemberg. Today it is a railway tunnel under Rosenstein Park to Bad Cannstatt. It now connects the Fils Valley Railway (Filstalbahn) from Stuttgart Central Station (Hauptbahnhof) to the Rosenstein Bridge over the Neckar to Bad Cannstatt station.