Brompton Oratory, also known as the London Oratory, is a Catholic parish church in the Brompton area of the Royal Borough of Kensington and Chelsea, London. Its name stems from the Oratorians, who live next door in the Oratory House and service the parish. The formal title of the church is the Church of the Immaculate Heart of Mary. Mass is celebrated daily by the Oratorians in both the Ordinary and Extraordinary forms.
The church was consecrated in 1884 and is built in the Neo-Baroque style and consists of a three-bay nave, transepts, and an apsed chancel with a dome over the crossing. It is listed at grade II* for its architectural significance.