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 16 kilometres west of the Sydney central business district.
The bay has natural and artificial shoreline on the southern side of the Parramatta River between the former suburb of Homebush Bay and the suburb of Rhodes. The bay was contaminated with dioxin and other chemicals by Union Carbide group which led to commercial fishing bans in most of Sydney Harbour and health advisories about limiting the quantity of fish eaten from the Parramatta River. Fishing is prohibited in Homebush Bay for health reasons. Other contamination includes phthalates, lead, polycyclic aromatic hydrocarbons, DDT and heavy metals. The eastern shore of the bay was remediated starting in 2008 to remove about 75% of the dioxin from the bay. Remediation was completed in mid-2010.