Hunsbury Hill Tunnel is a railway tunnel on the Northampton Loop Line of the West Coast Main Line. The tunnel runs in a straight line from the Briar Hill district of Northampton (north portal: 52°13′20″N 0°54′56″W / 52.2221869°N 0.915454°W / 52.2221869; -0.915454), England about north by east to the East Hunsbury district south of the town (south portal: 52°12′47″N 0°55′10″W / 52.213037°N 0.9193325°W / 52.213037; -0.9193325). The tunnel has a single bore with twin tracks and is 1,152 yards (1,053 m) long. It is about 1 mile south of Northampton railway station and the next station south is Wolverton in Milton Keynes. The tunnel opened together with the rest of the loop line in 1881.

52°13′04″N 0°55′03″W / 52.2178°N 0.9175°W / 52.2178; -0.9175