Ferntree Gully is a suburb in Melbourne, Victoria, Australia, at the foothills of the Dandenong Ranges, 30 km south-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. The suburb is on the Belgrave railway line and it takes between 42 minutes (stopping all stations and then express service from Box Hill) to 60 minutes (all stations service) to Flinders Street, CBD.