The University of London (UoL; abbreviated as Lond or more rarely Londin in post-nominals) is a federal public research university in London, England, United Kingdom. The university was established by royal charter in 1836 as a degree-awarding examination board for students holding certificates from University College London, King's College London, and "other such institutions, corporate or unincorporated, as shall be established for the purpose of Education, whether within the Metropolis or elsewhere within our United Kingdom". It is one of three institutions to have claimed the title of the third-oldest university in England. It moved to a federal structure with constituent colleges in 1900. It is now incorporated by its fourth (1863) royal charter and governed by the University of London Act 2018 (c. iii).
The university consists of 17 member institutions and three central academic bodies. It has around 48,000 distance learning external students and around 205,400 campus-based internal students, making it the largest university by number of students in the United Kingdom. For most practical purposes, ranging from admissions to funding, the member institutions operate on an independent basis, with many conferring their own degrees whilst remaining in the federal university.