Greatham Church (the dedication is unrecorded) is the Anglican parish church of the hamlet of Greatham in the district of Horsham, one of seven local government districts in the English county of West Sussex. The tiny single-room building has been described variously as "delightful" and "one of the most appealing churches in Sussex". The unrestored 12th-century stone church serves a rural area near the River Arun and sits apart from the hamlet next to the ancient manor house. The church is a Grade I Listed building.