The administrative area of Greater London contains thirty-two London boroughs. Inner London comprises twelve of these boroughs plus the City of London. Outer London comprises the twenty remaining boroughs of Greater London.

The London boroughs are administered by London Borough Councils which are elected every four years. The boroughs are the principal local authorities in London and are responsible for running most local services in their areas, such as schools, social services, waste collection and roads. Some London-wide services are run by the Greater London Authority, and some services and lobbying of government are pooled within London Councils. Some London borough councils also group together for such services as waste collection and disposal, e.g. the West London Waste Authority. The London boroughs are local government districts and have similar functions to metropolitan boroughs. Each London borough is a Local Education Authority. Until 1990 the Inner London boroughs were served by a shared LEA, the Inner London Education Authority.

London ⁱ/ˈlʌndən/ is the capital city of England and the United Kingdom, the largest metropolitan area in the United Kingdom, and the largest urban zone in the European Union by most measures. Located on the River Thames, London has been a major settlement for two millennia, its history going back to its founding by the Romans, who named it Londinium. London's ancient core, the City of London, largely retains its square-mile mediaeval boundaries. Since at least the 19th century, the name London has also referred to the metropolis developed around this core. The bulk of this conurbation forms the London region and the Greater London administrative area, governed by the elected Mayor of London and the London Assembly.

London is a leading global city, with strengths in the arts, commerce, education, entertainment, fashion, finance, healthcare, media, professional services, research and development, tourism and transport all contributing to its prominence. It is the world's leading financial centre alongside New York City and has the fifth-largest city GDP in the world (and the largest in Europe). London has been described as a world cultural capital. It was the world's most visited city during 2011 and London Heathrow is the world's busiest airport by number of international passengers. London's 43 universities form the largest concentration of higher education in Europe. In 2012 London will become the first city to host the modern Summer Olympic Games three times.