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 Sydney central business district (CBD) is the historical and main commercial centre of Sydney. The CBD is Sydney's city centre, or Sydney City, and the two terms are used interchangeably. Colloquially, the CBD or city centre is often referred to simply as "Town" or "the City". The Sydney city centre extends southwards for about 3 km (2 mi) from Sydney Cove, the point of first European settlement in which the Sydney region was initially established.