St Gregory's College Campbelltown is an independent Roman Catholic single-sex and co-educational comprehensive and specialist primary and secondary day and boarding school, located in Gregory Hills, near Campbelltown, a south-western suburb of Sydney, New South Wales, Australia. With specialist expertise as an agricultural school, St Gregory's College provides a co-educational environment for students in the Kindergarten to Year 6 primary school; and a boys-only environment for students in the Year 7 to Year 12 secondary schools.

Campbelltown is a suburb located on the outskirts of the metropolitan area of Sydney, New South Wales, Australia. It is located in Greater Western Sydney 53 kilometres (33 mi) south-west of the Sydney central business district by road. Campbelltown is the administrative seat of the local government area of the City of Campbelltown. It is also acknowledged on the register of the Geographical Names Board of New South Wales as one of only four cities within the Sydney metropolitan area.