Collaroy Plateau is a suburb of northern Sydney, in the state of New South Wales, Australia. Collaroy Plateau is 22 kilometres north-east of the Sydney central business district, in the local government area of Northern Beaches Council and is part of the Northern Beaches region.
Collaroy Plateau was designated as a separate suburb in 1977 with a postcode of 2098, but was reassigned as a locality within Collaroy in 1984, with the postcode changing to 2097 as part of Collaroy. In 2001 all localities were renamed Urban Places. In 2011 Collaroy Plateau, along with Wheeler Heights, was re-established as a suburb by the Geographical Names Board of NSW, after lobbying by the community, who had never ceased considering it to be a suburb since its loss of that title in 1984.
Collaroy Plateau has some of the most spectacular views in Sydney and on the Northern Beaches. Various parts of Collaroy Plateau overlook Collaroy Beach, Long Reef Beach, Narrabeen Beach and Narrabeen Lagoon.
Collaroy Beach is also the landing point of the PPC-1 submarine cable, one of three backhaul communication links connecting Australia to the wider Internet.