Buses in Sydney

Buses account for close to six per cent of trips each day in the city of Sydney, New South Wales, Australia, forming a key part of the city's public transport system. The network initially evolved from a privately operated system of feeder services to railway stations in the outer suburbs, and a publicly operated network of bus services introduced to replace trams in the inner suburbs. The bus network has undergone major reforms since the 2000s–2010s, with the New South Wales Government taking responsibility for route and fare-setting, opening contracts for most routes up to competitive tendering, and introducing more cross-suburban services.

The New South Wales Government's transport authority, Transport for NSW, administers the various bus networks in Sydney.

• Commuter bus services including Metrobus, B-Line and On Demand routes.
• NightRide, a network of train replacement services that operates each night between midnight and 5am.
• Bus only lanes and roadways associated with the Liverpool–Parramatta T-way and North-West T-way.
• Sydney Olympic Park bus routes, a network of nine routes used to convey passengers to major events at the precinct.
• School buses.

The networks, except the Olympic Park and On Demand routes, are part of Transport for NSW's Opal ticketing system.

Commuter and school services are assigned to one of 14 contract regions. In the 2019-20 financial year, 229.5 million passenger journeys were made on services in Sydney's bus contract regions.