Brompton Oratory, also known as the London Oratory, is a neo-classical late-Victorian Catholic parish church in the Brompton area of the Royal Borough of Kensington and Chelsea, neighbouring Knightsbridge, London. Its name stems from Oratorians, who own the building, live nextdoor at the London Oratory, and service the parish. The church's formal title is the Church of the Immaculate Heart of Mary.