Geertgen tot Sint Jans

(c. 1465 – c. 1495), also known as Gerrit Gerritsz, Geertgen van Haarlem or Gerrit van Haarlem, was an Early Netherlandish painter from the northern Low Countries in the Holy Roman Empire. His life is not well documented. He was born around 1465, possibly in Leiden. He was probably a pupil of Albert van Ouwater and lived for many years in the monastery of the Knights of Saint John in Haarlem. He died, probably still in his twenties, around the year 1495, in Haarlem, where he was buried in the monastery.

He painted with oil paint on wood panels. His paintings depict scenes derived from the New Testament and belong to the early Dutch School. Some of his paintings were destroyed during the Reformation.

In 1604, Karel van Mander described him with a quotation, attributed to Albrecht Dürer: "Truly, he was a painter in his Mother's womb.", saying Geertgen was predestined to become a painter. He is considered to be one of the most important 15th century painters from Holland.