The Hills District (alternatively, the Hills Shire, the Hills, or Sydney Hills, previously Baulkham Hills Shire, the Garden Shire) is a general term for the north-western suburbs of Sydney, in the state of New South Wales, Australia. Its constituent suburbs are generally located within the local government area of The Hills Shire; some parts of the Hornsby Shire are also included in the area that is given the title the Hills District.