St Paul's Cathedral is the Anglican cathedral for the diocese of London and therefore is an Anglican church (Church of England) and not a Catholic Church. South of the River Thames is the second Anglican diocese in London, the diocese of Southwark, served by the Anglican cathedral called Southwark Cathedral. The Catholic cathedral in London is Westminster Cathedral - the cathedral church for the Catholic diocese of London. Do not confuse Westminster Cathedral, however, with Westminster Abbey. The latter is not a cathedral but something called a 'royal peculiar' - a church owned and administered directly by Her Majesty the Queen.