Sydney Metro is a future automated rapid transit system in Sydney, New South Wales, Australia. Sydney will be the first Australian city to build a metro system. The network will be controlled by Sydney Metro which was established in July 2018 and is an operating agency owned by the NSW Government. It has been announced that Jon Lamonte will be the Chief Executive of Sydney Metro, which will be part of Transport for NSW's Opal ticketing system.

The second phase of the southern sector conversion would see two of the four tracks between Sydenham and Hurstville, part of the Sydney Trains Illawarra line, converted to rapid transit and added to the Sydney Metro network. This would increase rail capacity between Hurstville and the city by 10 trains per hour. Though a precise construction timeframe was not provided, the plan envisages all work being completed by 2031. The Hurstville conversion would add eight stations and 9 km (5.6 mi) to the metro network. Developing plans for this extension has proven difficult, and the Sydney Morning Herald reported in February 2016 that the project may have been dropped.