Hexham is a suburb of the city of Newcastle, about 15 km (9 mi) inland from Newcastle in New South Wales, Australia on the bank of the Hunter River.
Settlement occurred at Hexham in the 1820s when the land was granted to Edward Sparke. Hexham was named after the market town of Hexham, England with both towns being near to a Newcastle and sharing a history with one another; many of the coal miners from Newcastle upon Tyne and elsewhere in Northumberland moved to New South Wales at the time of settlement.
The history of Hexham is closely associated with that of the nearby suburbs of Tarro (originally Upper Hexham), Ash Island, Tomago and Minmi.
The mosquito species Ochlerotatus alternans is common in the area and adults, famed for their size and ferocity, are referred to as "Hexham Greys". The most famous Hexham Grey is "Ossie the Mossie", (sometimes spelled as "Ozzie the Mozzie") a large model of a mosquito that sits atop the Hexham Bowling Club sign at the corner of the Pacific Highway and Old Maitland Road in Hexham. The previous "Ossie" was replaced with a new "Ossie" (pictured) in 2005. Ozzie disappeared from the sign in early February 2010 and was replaced in April 2010.