Brooklyn is a suburb and the northern most town on the Pacific Highway in Sydney, New South Wales, Australia. Brooklyn is located on the northern outskirts of Sydney and is located in the local government area of the Hornsby Shire with a population of 737 as of the 2021 census. Brooklyn is surrounded by the Muogamarra Nature Reserve and occupies a strip of waterfront along the southern bank of the Hawkesbury River.

According to the 2021 census, there were 737 residents in Brooklyn. 76.7% of people were born in Australia, with the next most common countries of birth being England 5.7%, the United States of America 1.9%, New Zealand 1.5%, South Africa 1.5% and Scotland 0.9%. 90.0% of people only spoke English at home, the next most common languages sp[oken at home were Gujarati 1.2%, Russian 0.8%, German 0.7%, Afrikaans 0.7% and Swedish 0.7%. The most common responses for religion were No Religion 50.2%, Anglican 15.3%, Catholic 14.0 and Christian, not further defined 3.1%.

Hawkesbury River railway station is on the Main Northern railway line, which is served by Central Coast & Newcastle Line services. The Pacific Highway (B83) and the Pacific Motorway (M1) are major arterial roads located adjacent to Brooklyn. Access to Brooklyn via the Pacific Motorway requires exiting the motorway at Mooney Mooney on the northern shore of the Hawkesbury River and crossing the Peats Ferry Bridge via the Pacific Highway.