Jonathan Strange & Mr Norrell is the debut novel by British writer Susanna Clarke. Published in 2004, it is an alternative history set in 19th-century England around the time of the Napoleonic Wars. Its premise is that magic once existed in England and has returned with two men: Gilbert Norrell and Jonathan Strange. Centred on the relationship between these two men, the novel investigates the nature of "Englishness" and the boundaries between reason and unreason, Anglo-Saxon and Anglo-Dane, and Northern and Southern English cultural tropes/stereotypes. It has been described as a fantasy novel, an alternative history, and a historical novel. It inverts the Industrial Revolution conception of the North–South divide in England: in this book the North is romantic and magical, rather than rational and concrete.

Susanna Mary Clarke is an English author known for her debut novel Jonathan Strange & Mr Norrell (2004), a Hugo Award-winning alternative history. Clarke began Jonathan Strange in 1993 and worked on it during her spare time. For the next decade, she published short stories from the Strange universe, but it was not until 2003 that Bloomsbury bought her manuscript and began work on its publication. The novel became a best-seller.