Williamtown is a rural suburb of the Port Stephens local government area in the Hunter Region of New South Wales, Australia.

[7] 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.

Williamtown possesses a humid subtropical climate (Köppen: Cfa), with very warm, wet summers and mild, relatively dry winters.

[1] 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.