The Sydney Metropolitan Bus Service Contracts are contracts issued by the Government of New South Wales to metropolitan bus operators in Sydney, Australia, to operate its public bus route network. Since 2005, the government has moved from individual contracts with operators to larger contract regions, leading to the consolidation of bus operators.

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.