Frenchs Forest (pron. frenches) is a suburb of northern Sydney, in the state of New South Wales, Australia. Frenchs Forest is 13 kilometres north of the Sydney central business district in the local government area of Northern Beaches Council. Frenchs Forest is part of Sydney’s Northern Beaches region and also considered to be part of the Forest District, colloquially known as The Forest by its locals.

In the 2016 census of Population and Housing, the population of the Frenchs Forest postcode area was 13,473 people. The population was 50.4% females, 49.6% male. In Frenchs Forest,

The main routes through Frenchs Forest include the east-west Warringah Road (State route A38), connecting Roseville in the west with Brookvale in the east; the north-south Forest Way, starting at Warringah Road in Frenchs Forest and heading north through Belrose to Terrey Hills, connecting with Mona Vale Road (8 km); and the north-south Wakehurst Parkway (State route 22), starting at Narrabeen in the northeast, crossing Frenchs Forest Road and Warringah Road in Frenchs Forest, and heading south to Seaforth, leading to the Spit Bridge. Following any of these three major roads lead to the only three road routes off the Northern Beaches peninsula.