Bossley Park is a suburb of Sydney, in the state of New South Wales, Australia. Bossley Park is located 36 kilometres west of the Sydney central business district in the local government area of the City of Fairfield. Bossley Park is part of the Greater Western Sydney region. The suburb is most well known for being an ethnic enclave of Assyrian and other Iraqi ethnic groups living in Sydney. Furthermore, Bossley Park was Australia's most Catholic suburb in 2018, with 49.9% of residents being adherents of Catholicism.