Williamtown is a rural suburb of the Port Stephens local government area in the Hunter Region of New South Wales, Australia. It is located on the main road between Newcastle and Nelson Bay.
The eastern section of Williamtown is dominated by RAAF Base Williamtown and Newcastle Airport while the western section of the area is primarily semi-rural with some large-acreage residential areas scattered along Cabbage Tree Road which is a main access route to Port Stephens from the Pacific Highway. To the south Williamtown reaches Fullerton Cove, a large cove at the Hunter River. The south-eastern corner of the area reaches the Tasman Sea on Stockton Beach and access to the beach is possible at this point for off-road vehicles via Lavis Lane. After reaching the beach a popular destination is the wreck of the MV Sygna which lies just off the beach approximately 3.6 kilometres (2 mi) south-west.
Tomago sandbeds 
Most of Williamtown sits atop the Tomago sandbeds (an aquifer that is a critical source of water for the lower Hunter Region). The sandbeds are replenished primarily by rain as well as any water that leaks from Grahamstown Dam in nearby Ferodale. Water from the sandbeds and the dam is treated in Tomago.
- ^ 2011 ABS Quickstats data includes residents of Campvale living along Richardson Road, between Grahamstown Dam and Medowie Road.
- ^ Average elevation of the suburb as shown on 1:100000 map 9232 NEWCASTLE.
- ^ Area calculation is based on 1:100000 map 9232 NEWCASTLE.