RAAF Base Williamtown is a Royal Australian Air Force (RAAF) military air base located 8 nautical miles north of Newcastle in the local government area of Port Stephens, in New South Wales, Australia. The base serves as the headquarters to both the Air Combat Group and the Surveillance and Response Group of the RAAF. The military base shares its runway facilities with Newcastle Airport. The nearest towns are Raymond Terrace, located 8 km (5 mi) west of the base and Medowie, 6.8 km (4.2 mi), north of the base, which is home to many of the base's staff.

Newcastle or Greater Newcastle, locally nicknamed Newy, is a regional metropolitan area and the second-most-populated district in New South Wales, Australia. It includes the cities of Newcastle and Lake Macquarie; it is the hub of the Lower Hunter region, which includes most parts of the local government areas of City of Newcastle, City of Lake Macquarie, City of Maitland, City of Cessnock, and Port Stephens Council.