Transit Systems Victoria, formerly Sita Buslines, is a bus and coach operator in Melbourne, Australia.

It is a subsidiary of Transit Systems and operates 18 bus routes under contract to Public Transport Victoria.

[2] In January 1972, Sita purchased Grangers Bus Lines, which operated route 472 Moonee Ponds Junction - Williamstown Beach.

[3][4][5] Sita commenced coach operations in 1982, initially with second hand Denning vehicles, before building up a large Austral Tourmaster fleet after 1984.

On 1 July 2018, Sita commenced a new ten-year performance-based contract to operate its bus services.