The Barbican Estate, or Barbican, is a residential complex of around 2,000 flats, maisonettes, and houses in central London, England, within the City of London. It is in an area once devastated by World War II bombings and densely populated by financial institutions, 1.4 miles (2.2 km) north east of Charing Cross. Originally built as rental housing for middle and upper-middle-class professionals, it remains an upmarket residential estate. It contains, or is adjacent to, the Barbican Arts Centre, the Museum of London, the Guildhall School of Music and Drama, the Barbican public library, the City of London School for Girls and a YMCA, forming the Barbican Complex.

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.