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Jean-Charles, marquis de Saint-Nectaire (11 November 1685 – 23 January 1771, Didonne, Saintonge) was a French aristocrat, diplomat and Marshal of France.
Descended from a noble family who were lords of Brinon, barons of Didonne-sur-Marche, Saint-Germain-sur-Vienne and Brillac as well as holding other lordships in the Auvergne, and Counts of Saint-Victour in the Peerage of France, his father was François de Saint-Nectaire (died 1710), comte de Brinon (cr. 1608) (styled comte de Saint-Nectaire), and his mother was Marie daughter of Charles de Béchillon, baron d'Irlaud.