Sandrine Piau (b. 5 June 1965 in Issy-les-Moulineaux, France) is an opera soprano. Trained as a harpist, she studied voice at the Collège Lamartine and the Conservatoire National Supérieur de Musique du Paris. She is best known for her roles in Baroque opera, having worked with William Christie at the Festival international d'Art Lyrique at Aix-en-Provence. She has since collaborated with many of the leading European conductors of the Baroque revival, including Marc Minkowski, Philippe Herreweghe, Paul McCreesh, Alan Curtis, Ton Koopman, Christophe Rousset, René Jacobs, and Fabio Biondi.