The Bargo Railway Viaduct is a heritage-listed railway viaduct over the Bargo River located on the Main South railway approximately 96 kilometres (60 mi) from Central, in the south-western Sydney settlement of Bargo in the Wollondilly Shire local government area of New South Wales, Australia. The viaduct was designed by New South Wales Government Railways and built in 1919. It is also known as Bargo River Railway Viaduct. The property is owned by RailCorp, an agency of the Government of New South Wales. It was added to the New South Wales State Heritage Register on 2 April 1999.