Universalis Ecclesiae was a papal bull of 29 September 1850 by which Pope Pius IX recreated the Roman Catholic diocesan hierarchy in England, which had been extinguished with the death of the last Marian bishop in the reign of Elizabeth I. New names were given to the dioceses, as the old ones were in use by the Church of England. The bull aroused considerable anti-Catholic feeling among English Protestants.

The Diocese of Westminster is a Latin archdiocese of the Catholic Church in England. The diocese consists of most of London north of the River Thames and west of the River Lea, the borough of Spelthorne, and the county of Hertfordshire, which lies immediately to London's north.