Tregear is a suburb of Sydney, in the state of New South Wales, Australia. Tregear is 46 kilometres (29 mi) west of the Sydney central business district, in the local government area of the City of Blacktown and is part of the Greater Western Sydney region.
Tregear has privately owned housing, Department of Housing homes and a small shopping centre.
At the 2011 census, Tregear had 3,916 people listing Tregear as their usual residence. There were slightly more women than men, more than 10% were indigenous and almost 30% were born overseas. The land area amounts to 163 hectares.