Simon Marmion was a French and Burgundian Early Netherlandish painter of panels and illuminated manuscripts. Marmion lived and worked in what is now France but for most of his lifetime was part of the Duchy of Burgundy in the Southern Netherlands.

Like many painters of his era, Marmion came from a family of artists, and both his father, Jean, and his brother Mille were painters. Marmion is recorded as working at Amiens between 1449 and 1454, and then at Valenciennes from 1458 until his death. He was patronized by Philip the Good, the Duke of Burgundy from 1454 when he was one of several artists called to Lille to work on the decorations for the Feast of the Pheasant. He was employed by several members of the ducal family, including Charles the Bold and Margaret of York. He was called "the prince of illuminators" by a near contemporary. Three years after his death his widow, Jeanne de Quaroube, married his pupil, the painter Jan Provoost, who on her death inherited the considerable Marmion estate.

Although best known for his illuminated manuscripts, Marmion also produced portraits and other paintings, altarpieces, and decorative work. A famous double-sided altarpiece with several Scenes from the life of St Bertin is in the Gemäldegalerie, Berlin (with two sections in the National Gallery (London). There is a Mass of Saint Gregory in Toronto, and a Lamentation of Christ in the Metropolitan Museum of Art, three works in Philadelphia, and several others elsewhere. Stylistically he lies between his French and Flemish contemporaries, with a Flemish innovation in composition and landscape. His perspective is usually technically sound, but the proportions of his figures are often awkward, and their poses rather stiff.