Homebush Bay is a bay on the south bank of the Parramatta River, in the west of Sydney, Australia. The name is also sometimes used to refer to an area to the west and south of the bay itself, which was formerly an official suburb of Sydney, and has now become the suburbs of Sydney Olympic Park, Wentworth Point and part of the neighbouring suburb of Lidcombe, all part of the City of Parramatta. Homebush Bay is located 13 kilometres (8.1 mi) west of the Sydney central business district.

The Parramatta River is an intermediate tide-dominated, drowned valley estuary located in Sydney, New South Wales, Australia. With an average depth of 5.1 metres (17 ft), the Parramatta River is the main tributary of Sydney Harbour, a branch of Port Jackson. Secondary tributaries include the smaller Lane Cove and Duck rivers.