The Hardt Railway (German: Hardtbahn) is a railway line in the Karlsruhe region of Germany. Originally built as part of the Rhine Railway, a through main line, it now forms a branch line from Karlsruhe to Hochstetten. The line runs along the western edge of the forest of Hardtwald, from which it takes its name. Today the line is owned and operated, as part of the Stadtbahn Karlsruhe, by the Albtal-Verkehrs-Gesellschaft (AVG).