The University of London is a federal university made up of 31 affiliates: 19 separate university institutions, and 12 research institutes. As such, the University of London is the largest university in the UK by number of full-time students, with 135,090 campus-based students and over 50,000 in the University of London International Programmes.

The university was first established by a Royal Charter in 1836, which brought together in federation London University (now University College London) and King's College (now King's College London), to establish today's federally structured University of London.

Graduates of the University of London often use the post-nominal letters 'Lond.' or, more rarely, 'Londin.' (both from Londiniensis) after their degree abbreviations (see post-nominal abbreviations).

Founded in 1836, the University at first comprised just two colleges: University College London, which previously had no official chartered status and did not apply religious tests to its students, and King's College, which had been chartered since 1829 and which admitted only members of the Church of England. Both King's (founded 1829) and University College London (founded 1826) pre-date the University of London, which initially served solely as an examining body for the constituent colleges.

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.