The Outer Sydney Metropolitan Bus Service Contracts (OSMBSC) are contracts issued by the Government of New South Wales to bus operators in areas surrounding Sydney. These regions include the Hunter Region, Central Coast, Illawarra and the Blue Mountains. In 2016–17, 21.6 million passenger journeys were made on Outer Metropolitan bus services.

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.