The Inner West & Leppington Line is a commuter rail service currently operated by Sydney Trains, serving the inner west and south-western regions of Sydney, Australia. Consisting of 37 stops, the service commences from the City Circle, then heads west to Granville. The line branches at this point; services either head northwest to Parramatta or south to Leppington. A third terminus at Homebush is used when the part-time Parramatta branch isn't operating. The line commenced operations on 26 November 2017, replacing the T2 Airport, Inner West & South Line.

Sydney Trains is the operator and brand name of the train network serving the Greater Sydney metropolitan area in New South Wales, Australia. The network is a hybrid urban-suburban rail system with a central underground core that covers 369 km (229 mi) of route length over 813 km (505 mi) of track, with 170 stations on eight lines.