Peakhurst is a suburb in southern Sydney, in the state of New South Wales, Australia. Peakhurst is located 21 kilometres south of the Sydney central business district and is part of the St George area. Peakhurst is in the local government area of the City of Hurstville. Peakhurst is colloquially known as 'Peaky'.

Peakhurst has a western border on Salt Pan Creek, on the Georges River. Peakhurst Heights is a separate suburb to the south, which is bordered by Boggywell Creek and Lime Kiln Bay, on the Georges River. Peakhurst Heights is sometimes still considered to be part of 'Peakhurst' by some residents of the area.