The Acts of King Arthur and His Noble Knights (1976) is John Steinbeck's retelling of the Arthurian legend, based on the Winchester Manuscript text of Sir Thomas Malory's Le Morte d'Arthur.

He followed Malory's structure and retained the original chapter titles, but he explored the psychological underpinning of the events, and tuned the use of language to sound natural and accessible to a Modern English speaker:[2]: Appendix, letter dated July 7, 1958, p. 318.

From March to October 1959, Steinbeck and his wife Elaine rented a cottage in the hamlet of Discove, Redlynch, near Bruton in Somerset, England, while Steinbeck researched his retelling of the Arthurian legend of King Arthur and the Knights of the Round Table.

Glastonbury Tor was visible from the cottage, and Steinbeck also visited the nearby hillfort of Cadbury Castle, the supposed site of King Arthur's court of Camelot.

The unfinished manuscript was published after his death in 1976, as The Acts of King Arthur and His Noble Knights.