At which university did C.S. Lewis teach after leaving Oxford?

After leaving Oxford, C.S. Lewis taught at the University of Cambridge.

Lewis became the first holder of the newly established chair of Medieval and Renaissance Literature at Magdalene College, Cambridge, in 1954. He remained there until his death in 1963. Before Cambridge, he had spent most of his academic career at Oxford, where he was a tutor and fellow of Magdalen College.

The question is distinct from asking which university awarded Lewis a chair from 1954: the relevant institution was Cambridge, specifically Magdalene College. Oxford and Cambridge are separate universities, although both are collegiate institutions and are often mentioned together in accounts of Lewis’s career.

Lewis’s Cambridge appointment reflected his reputation as a literary scholar, especially in medieval and Renaissance literature. His public fame also grew through Christian apologetics, fiction, lectures, and radio broadcasts. His move did not mean that he abandoned Oxford entirely; he continued to live in the Oxford area and maintained long-standing connections there.