The Sydney Harbour National Park is an Australian national park comprising parts of Port Jackson, Sydney and its foreshores and various islands. The 392-hectare (970-acre) national park lies in New South Wales and was created progressively, from 1975.

Port Jackson, consisting of the waters of Sydney Harbour, Middle Harbour, North Harbour and the Lane Cove and Parramatta Rivers, is the ria or natural harbour of Sydney, New South Wales, Australia. The harbour is an inlet of the Tasman Sea. It is the location of the Sydney Opera House and Sydney Harbour Bridge. The location of the first European settlement and colony on the Australian mainland, Port Jackson has continued to play a key role in the history and development of Sydney.