Dee Why is a coastal suburb of northern Sydney, in the state of New South Wales, Australia, 18 kilometres north-east of the Sydney central business district. It is the administrative centre of the local government area of Northern Beaches Council and, along with Brookvale, is considered to be the main centre of the Northern Beaches region.

The Northern Beaches Council is a local government area located in the Northern Beaches region of Sydney, in the state of New South Wales, Australia. The council was formed on 12 May 2016 after the amalgamation of Manly, Pittwater, and Warringah councils.