The Steyr Valley Railway (German: Steyrtalbahn) was a 760 mm (2 ft 5 15⁄16 in) narrow gauge railway in Upper Austria, which ran along the valley of the River Steyr from Garsten through Steyr, Grünburg and Molln to Klaus, with a branchline to Sierning and Bad Hall. A section of the line has been retained as a museum railway.