The University of Cambridge (informally Cambridge University or Cambridge) is a public research university located in Cambridge, United Kingdom. It is the second-oldest university in the English-speaking world (after the University of Oxford), and the seventh-oldest globally. In post-nominals the university's name is abbreviated as Cantab, a shortened form of Cantabrigiensis (an adjective derived from Cantabrigia, the Latinised form of Cambridge).

The university grew out of an association of scholars in the city of Cambridge that was formed in 1209, early records suggest, by scholars leaving Oxford after a dispute with townsfolk. The two "ancient universities" have many common features and are often jointly referred to as Oxbridge. In addition to cultural and practical associations as a historic part of British society, they have a long history of rivalry with each other.

Cambridge ranks first in the world in both the 2010 and 2011 QS World University Rankings, sixth in the world in the 2011 Times Higher Education World University Rankings, and fifth in the world (and first in Europe) in the 2011 Academic Ranking of World Universities. Cambridge regularly contends with Oxford for first place in UK league tables. In the most recently published ranking of UK universities, published by The Guardian newspaper, Cambridge was ranked first.