Marie Le Rochois (c. 1658 – 8 October 1728) was a French operatic soprano who belonged to the Académie Royale de Musique. She is often referred to as Marthe Le Rochois or simply La Rochois.
She was introduced to Jean-Baptiste Lully, possibly by his father-in-law Michel Lambert who may have been her teacher, and became a member of the Paris Opéra in 1678. She sang in operas by Lully, Pascal Collasse, Henri Desmarets, Marc-Antoine Charpentier, André Campra, Marin Marais, and André Cardinal Destouches but she was best regarded for her portrayal of Armide in Lully's opera.
Unlike some of her wilder colleagues at the opera, Julie d'Aubigny and Fanchon Moreau, she enjoyed a reputation for moral rectitude. Less of a celebrity, she was more of an artist, as indicated by the number of important roles with which she was entrusted by Lully and his successors.
After retiring from the stage in 1698, she became a teacher, while remaining active in the contemporary arts social world. Her students included Marie Antier and Françoise Journet. She died in Paris in 1728.