Galston is a semi-rural suburb located in The Hills District of Sydney, in the state of New South Wales, Australia. Galston is located from the city at 36 kilometres north-west of the Sydney central business district, in the local government area of the Hornsby Shire. Galston is in the NSW state electoral district of Hornsby and Federal division of Berowra. Galston is situated 16 minutes away from the suburb of Hornsby.