Martial Piéchaud (6 September 1888 in Bordeaux – 24 August 1957 in Nay), was a 20th-century French writer, literary critic and playwright.
His father, Timothée Piéchaud [fr], was a professor at the Faculty of Medicine of Bordeaux and eminent surgeon.
His mother, Marie Cardez, was the daughter of Roman count [fr] Ferdinand Cardez, and descended from an old family of Bordeaux wine merchants, his family owning the Jourdan, Carsin, Villandraut and Deylet vineyards (Rions).
As a playwright he authored Le Sommeil des amants given at the Théâtre Antoine, Le Quatrième, presented at the Comédie-Française and Mademoiselle Pascal at the Théâtre de l'Odéon.
His brother, Louis Piéchaud, was also a close friend to François Mauriac, who mentioned him several times in his Nouvelles Lettres d'une vie 1906-1970, as well as Martial.