Stephen Maturin ( /ˈmætʃʊərɪn/) is a fictional character in the Aubrey–Maturin series of novels by Patrick O'Brian. The series portrays his career as a physician, naturalist and spy in the Royal Navy during the Napoleonic Wars, and the long pursuit of his beloved Diana Villiers.
Maturin was played by Paul Bettany in the 2003 film Master and Commander: The Far Side of the World and by Richard Dillane in the BBC Radio 4 adaptations of the O'Brian novels.