Liverpool Weir, Heritage-listed weir in Liverpool, Sydney, Australia

Liverpool Weir is a heritage-listed weir on the Georges River at Heathcote Road near Newbridge Road, Liverpool, Sydney. Designed by David Lennox and built from 1836 by convict labour under Captain W. H. Christie, it is also known as Bourke's Dam. It was added to the New South Wales State Heritage Register on 13 August 2010.

Liverpool Weir was built in 1836 to supply water to Liverpool's farmers and townspeople and to serve as a causeway across the Georges River. It was designed by David Lennox, Superintendent of Bridges, and constructed by convict labour under Captain W. H. Christie. It is the only weir Lennox is known to have designed in the colony and one of Liverpool's last two convict-built public works, with Lansdowne Bridge. It joined the New South Wales State Heritage Register on 13 August 2010.

The Georges River area was originally inhabited by the Darug, Tharawal, and Gandangara peoples who used the waterway for transport and communication.

You can reach the structure through Lighthorse Park or via the eastern entry point along Newbridge Road. Both access routes offer different views of the historic construction.

The construction raised the water level by about two meters and created the river's tidal boundary. This change transformed previously unusable land into valuable farming ground.