Double Bay is a harbourside eastern suburb of Sydney, in the state of New South Wales, Australia 4 kilometres east of the Sydney central business district. It is the administrative centre of the local government area of the Municipality of Woollahra.

According to the 2021 census, there were 4,709 residents in Double Bay. 60.6% of people were born in Australia; the next most common countries of birth included England 6.0%, South Africa 3.8%, New Zealand 2.8%, China (excluding Special Administrative Regions and Taiwan) 2.0%, and the United States of America 1.6%. 79.2% of people only spoke English at home; the next most common languages at home included Mandarin 2.3%, Spanish 1.4%, Cantonese 1.3%, French 1.2%, and Italian 1.1%. The most common ancestries in Double Bay included English 32.1%, Australian 24.4%, Irish 13.4%, Scottish 9.2%, and Chinese 5.8%. The most common responses for religion were No Religion 37.4%, Catholic 19.5%, Judaism 13.9%, and Anglican 14.7%; a further 6.1% of respondents elected not to disclose their religion.

Double Bay features a ferry wharf for Double Bay ferry services with regular services to Circular Quay and Darling Point. Bus services operate via New South Head Road to Bondi Junction, Watsons Bay and the City. The closest railway station is Edgecliff on New South Head Road.