Lorenzo Monaco (born Piero di Giovanni c.1370-1425) was a Florentine painter. He joined the Camaldolese monastery of Santa Maria degli Angeli in Florence in 1391. (His name translates as "Lawrence the Monk".) His work shows the influence of the International Gothic style of the late fourteenth century, as well as that of the Sienese school.

His works include:

• Madonna and Child with Saints (1395-1402)
• An altarpiece depicting the Coronation of the Virgin (c.1407-9) painted for the Camaldolese monastery
• Incidents in the Life of Saint Benedict (c.1407-9)
• The Nativity (1409), a panel believed to form part of a predella
• An altarpiece of the Coronation of the Virgin (1414) also for Santa Maria degli Angeli
• Adoration of the Magi (1422)

Giorgio Vasari includes a biography of Lorenzo Monaco in his Lives.