The Liverpool–Parramatta T-way is a bus rapid transit line in the western suburbs of Sydney, Australia. "T-way" is short for rapid bus transitway.

The 31 km (19.3 mi) T-way links the railway stations at Parramatta and Liverpool via a series of bus-only roadways and bus lanes. Services using the T-way are operated by Transit Systems Sydney. Before that, these services were operated by Western Sydney Buses (a subsidiary of the State Transit Authority). They were under Sydney Bus Region 3 and were transferred to Transit Systems Sydney on 13 October 2013, after it was awarded the tender to be the new operator of the region including the T-way.

A long-awaited first step in a plan to improve public transport services in Western Sydney, the T-way initially failed to live up to expectations, carrying half the number of passengers expected. Patronage has increased significantly, with annual patronage increasing by 328,000 in 2006. Patronage continues to grow, and in 2014-15 services were operating at capacity.

The T-way was constructed as a joint venture between the New South Wales Ministry of Transport and the Roads & Traffic Authority opening in February 2003 at a cost of $346 million.

The line runs through the central business district of Parramatta, before heading onto the Great Western Highway to South Wentworthville, after which it heads onto its own alignment next to the Sydney Water pipeline that runs from Prospect Reservoir. It then proceeds on its own alignment in an old freeway reservation through to Hoxton Park. At Brickmakers' Creek in Liverpool it heads onto its own alignment to the centre of Liverpool and the railway station bus interchange. The system includes active traffic signal priority to give buses preference where the route crosses other roadways.

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