Ferntree Gully is a suburb in Melbourne, Victoria, Australia, at the foothills of the Dandenong Ranges, 30 km east of Melbourne's Central Business District, located within the City of Knox local government area. Ferntree Gully recorded a population of 27,398 at the 2021 census. Ferntree Gully, The Basin, Boronia and Upper Ferntree Gully are the only Dandenong Ranges towns or suburbs in the City of Knox.