The Hills Shire is a local government area in the Greater Sydney region of Sydney, New South Wales, Australia. The area is north-west of the Sydney central business district, and encompasses 401 square kilometres (155 sq mi) stretching from the M2 Hills Motorway in the south to Wisemans Ferry on the Hawkesbury River in the north. The Hills Shire had a population of 191,876 as of the 2021 census.

M2 Hills Motorway is a 19.3-kilometre (12.0 mi) tolled urban motorway in Sydney, New South Wales that is part of the Sydney Orbital Network and the National Highway west of Pennant Hills Road. Owned by toll road operator Transurban, it forms majority of Sydney's M2 route, with the Lane Cove Tunnel constituting the rest of the M2 route.