Michael Sittow (c. 1469 – 1525), also known as Master Michiel, Michel Sittow, Michiel, Miguel and many other variants, was a painter from Reval (now Tallinn, Estonia) who was trained in the tradition of Early Netherlandish painting. For most of his life, Sittow worked as a court portrait painter, for Isabella of Castille, the Habsburgs and others in Spain and the Netherlands. He was one of the most important Flemish painters of the era.