Marist Catholic College Penshurst is an independent systemic Roman Catholic co-educational secondary school located in Penshurst, a southern suburb of Sydney, Australia. The school currently caters for approximately 1000 students from Years 7 to 12. Since 2020, the school has been split among two campuses, Years 7–8 at South Hurstville, and Years 9–12 at the original site in Mortdale.

Penshurst is a suburb in southern Sydney, in the state of New South Wales, Australia. Penshurst is located 17 kilometres south of the Sydney central business district and is part of the St George area.