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

The centerpiece of this small town is Tanilba House, on Caswell Crescent, which is listed on the New South Wales State Heritage Register along with The Temple of the Stork nearby.

[citation needed] In 1831 Lieut William Caswell, Royal Navy, received a land grant of 20.2 hectares (50 acres), along with an assignment of convicts who cleared the land and built Tanilba House from locally quarried quartz porphry stone and lime mortar made on the property from oyster shells.

A bunya pine, the wisteria covered pergola and two Port Jackson figs are also specifically listed.

The Caswells were impacted by drought and deprived of most of their workforce due to the ceasing of transportation of convict labour by the English government and left the house in 1840s.

Significant restoration and repair of the house was conducted by Elizabeth Holmes in the 1890s using the same builder who built Stanley Park in Fullerton Cove.

[14] The main beach in Tanilba Bay is located on the southern side of Port Stephens and runs from east to west.