The Stanmore branch line was a railway line in Harrow, Middlesex (now Greater London), in the United Kingdom. Located to the north of London, it provided commuter rail services between Harrow and the village of Stanmore. Beginning at Harrow station (now called Harrow & Wealdstone), the line split off from the West Coast Main Line and followed a short 2.12-mile (3.41 km) route to Stanmore.