St John's College, formally the College of St John the Evangelist in the University of Cambridge, is a constituent college of the University of Cambridge, founded by the Tudor matriarch Lady Margaret Beaufort. In constitutional terms, the college is a charitable corporation established by a charter dated 9 April 1511. The aims of the college, as specified by its statutes, are the promotion of education, religion, learning and research. It is one of the largest Oxbridge colleges in terms of student numbers. For 2022, St John's was ranked 6th of 29 colleges in the Tompkins Table with over 35 per cent of its students earning first-class honours. It is the second wealthiest college in Oxford and Cambridge, after its neighbour Trinity College, Cambridge.

The University of Cambridge is a public collegiate research university in Cambridge, England. Founded in 1209, the University of Cambridge is the world's third-oldest university in continuous operation. The university's founding followed the arrival of scholars who left the University of Oxford for Cambridge after a dispute with local townspeople. The two ancient English universities, although sometimes described as rivals, share many common features and are often jointly referred to as Oxbridge.