Collaroy is a suburb in northern Sydney, in the state of New South Wales, Australia. Collaroy is 22 kilometres north-east of the Sydney central business district, in the local government area of Warringah council. It is part of the Northern Beaches region.

History: This area was originally part of Narrabeen but was renamed after the collier s.s collaroy ran aground on the beach in 1881 during a storm. it was refloated and later wreced on the California coast in 1889. Most of development has accurred since the mid twentieth century.

Collaroy Beach Post Office opended on 12 Februaly 1923. Collaroy Plateu Post Office opened on 1 April 1949 and closed in 1988. Collaroy Plateau West Post Office opened on 1 November 1967 and was renamed Collaroy Plateu in 1996.