The Apostolic Vicar (or Vicar Apostolic) of the Western District was the title given to the Roman Catholic bishop who, between 1688 and 1850, headed the Church's ecclesiastical jurisdiction in England known as the Apostolic Vicariate (or Vicariate Apostolic) of the Western District.
Soon after the accession of Queen Elizabeth I, the bishops of England were forced to choose between taking the Oath of Supremacy, thus denying the authority of the Pope, or losing their episcopal sees. Those who chose to continue their allegiance to Rome were subsequently deposed and replaced in their sees by priests of the Church of England. Most of the deposed Bishops were imprisoned in various locations and died in captivity over a period of years, though some left the country and continued their work overseas. The last of the deposed bishops was Thomas Goldwell, Bishop of St Asaph, who died in Rome on April 3, 1585.
In 1623, Pope Urban VIII decided once again to provide a bishop with jurisdiction in England. So it was that Dr William Bishop was appointed, with the title of Apostolic Vicar of England. He died shortly afterwards and was succeeded by Dr Richard Smith, who in August 1631 was forced to resign and fled to France. The office then remained vacant until its revival in 1685 with the appointment of Dr John Leyburn as Bishop.
In 1623 the first Apostolic Vicar, Dr Bishop, divided England into six areas and placed a superior at the head of each with the title of vicar general. This structure remained in place until Dr Leyburn reduced the number from six to four. It was on the basis of these four areas that on January 20, 1688 Pope Innocent XI increased the number of (titular) bishops in England to four. The territory of the former single Apostolic Vicariate was thereby reduced, becoming the Vicariate Apostolic of the London District. So it was that the Apostolic Vicariate of the Western District was created, along with the Apostolic Vicariate of the Northern District and the Apostolic Vicariate of the Midland District.