Rosso Fiorentino (Giovanni Battista di Jacopo), March 8, 1494–November 14, 1540, was a Florentine painter, draughtsman, and print designer. He trained in the workshop of Andrea del Sarto and studied the work of Michelangelo and Baccio Bandinelli. He worked in Florence from 1513 to 1523, then in Rome and elsewhere in Italy.

In 1530, Rosso entered the service of Francis I of France and joined Francesco Primaticcio at the royal château of Fontainebleau. He designed and painted work for the palace, including the Galerie François Ier, and helped shape the Fontainebleau school.

Paintings and drawings by Rosso Fiorentino are held by the Uffizi and Palazzo Pitti in Florence, the National Gallery in London, the Museum of Fine Arts in Boston, the Louvre in Paris, the Metropolitan Museum of Art in New York, the Los Angeles County Museum of Art, and Nationalmuseum in Stockholm.