The Apostolic Nunciature to Great Britain is an ecclesiastical office of the Roman Catholic Church in Great Britain. It is a diplomatic post of the Holy See, whose representative is called the Apostolic Nuncio to the Court of St. James's with the rank of an ambassador. The office of the nunciature is located in London, lying within the Archdiocese of Southwark and overlooking Wimbledon Common. It is notable for being the only diplomatic mission in London located south of the river Thames.