Paternoster Square is a former historic square, renamed from Newgate Market c. 1872, and now a post-war urban redevelopment, owned by the Mitsubishi Estate, next to St Paul's Cathedral in the City of London. The area, previously named Paternoster Row, after the street of the same name, once centre of the London publishing trade, was devastated by aerial bombardment in The Blitz during World War II. It is now the location of the London Stock Exchange which relocated there from Threadneedle Street in 2004. It is also the location of investment banks such as Goldman Sachs, Merrill and Nomura Securities, and of fund manager Fidelity Investments. The square itself, i.e. the plaza, is privately owned public space. In 2004, Christopher Wren's 1669 Temple Bar Gate was re-erected here as an entrance way to the plaza.

The City of London, widely referred to simply as the City, is a city, ceremonial county and local government district that contains the ancient centre, and constitutes, along with Canary Wharf, the primary central business district (CBD) of London and one of the leading financial centres of the world. It constituted most of London from its settlement by the Romans in the 1st century AD to the Middle Ages, but the modern area referred to as London has since grown far beyond the City of London boundary. The City is now only a small part of the metropolis of Greater London, though it remains a notable part of central London. The City of London is not one of the London boroughs, a status reserved for the other 32 districts. It is also a separate ceremonial county, being an enclave surrounded by Greater London, and is the smallest ceremonial county in England.