The Domain is a heritage-listed 34-hectare (84-acre) area of open space on the eastern fringe of the Sydney central business district, in the City of Sydney local government area of New South Wales, Australia. Separating the central business district from Woolloomooloo, The Domain adjoins the Royal Botanic Garden and is managed by The Royal Botanic Gardens and Domain Trust, a division of the NSW Office of Environment and Heritage, an agency of the Government of New South Wales. The Domain is used as a venue for outdoor concerts, open-air events, large political gatherings and rallies, as well as being used daily by the people of Sydney for exercise and relaxation. Along with the Royal Botanic Garden, The Domain was added to the New South Wales State Heritage Register on 2 April 1999.

The City of Sydney is the local government area covering the Sydney central business district and surrounding inner city suburbs of the greater metropolitan area of Sydney, New South Wales, Australia. Established by Act of Parliament in 1842, the City of Sydney is the oldest, and the oldest-surviving, local government authority in New South Wales, and the second-oldest in Australia, with only the City of Adelaide being older by two years.