The South Maitland Railway was once an extensive network of privately owned colliery and passenger railway lines which served the South Maitland coalfields in the Hunter Region of New South Wales, Australia and were the second last system in Australia to use steam haulage, having used steam locomotives until 1983.

The South Maitland coalfields was the most extensive coalfield in New South Wales until the great coal mining slump of the 1960s. It was discovered by Lieutenant-Colonel William Paterson's party when they were engaged in an exploratory visit to the Hunter Valley during July 1801.