The Spit Bridge, a steel and concrete girder bridge with a bascule lift span across the Middle Harbour, is located 10 kilometres (6.2 mi) north-east of the central business district in Sydney, Australia. The bridge carries The Spit Road (A8) from a point called The Spit, and connects the suburbs of Mosman, on the south bank and Seaforth, on the north bank.

Middle Harbour, a semi–mature tide dominated drowned valley estuary, is the northern arm of Port Jackson, an inlet of the Tasman Sea located north of Sydney central business district on the coast of New South Wales, Australia.