Le Morte d'Arthur is a compilation by Sir Thomas Malory of romance-era tales about the legendary King Arthur, Guinevere, Lancelot, and the Knights of the Round Table. Malory interprets existing French and English stories about these figures and adds original material.

First published in 1485 by William Caxton, Le Morte d'Arthur is today perhaps the best-known work of Arthurian literature in English. Many modern Arthurian writers have used Malory as their principal source, including T. H. White in his popular The Once and Future King and Tennyson in The Idylls of the King.

Sir Thomas Malory (died 14 March 1471) was an English writer, the author or compiler of Le Morte d'Arthur. Since the late nineteenth century he has generally been identified as Sir Thomas Malory of Newbold Revel in Warwickshire, a knight, land-owner and Member of Parliament. Previously, it was suggested by antiquary John Leland as well as John Bale that he was Welsh (identifying 'Malory' with 'Maelor'). Occasionally, other candidates are put forward for authorship of Le Morte d'Arthur, but the supporting evidence for their claim has been described as 'no more than circumstantial'.