Maria van Oosterwijck, also spelled Oosterwyck, (1630–1693) was a Dutch Golden Age painter, specializing in richly detailed flower paintings and other still lifes.
Maria van Oosterwijck was born in 1630 in Nootdorp, a town located near Delft in South Holland, the Netherlands. Her date of birth is generally listed as 20 August, but some sources state that it was 27 August. Her father was a Dutch Reformed Church minister, as was her grandfather. Her father took her, when she was quite young, to masterful still life painter Jan Davidsz. de Heem's studio. With de Heem's influence, van Oosterwijck developed her interest in floral painting. She became his student, and she showed herself to have a talent for vividly painting realistic creations.
Van Oosterwijck initially worked in Delft and later moved to Utrecht. She worked with de Heem, and years later she produced her first professional piece which had been created independently. When de Heem moved to Antwerp, van Oosterwijck had ample opportunity for independent painting.
Sometime in the early- to mid-1670s, she moved to Amsterdam, where her studio was opposite the workshop of fellow flower painter Willem van Aelst. Van Aelst courted her, but she refused his hand, and he reportedly stopped pursuing her because her devotion to painting was more important to her. Van Oosterwijck remained single throughout her life, but she raised her nephew, who had been orphaned.
In addition to being a talented painter, she was also a savvy businesswoman; she obtained the services of an agent in Amsterdam to market her pieces to Germans. Among her patrons were Louis XIV of France, the Holy Roman Emperor Leopold I, Augustus II the Strong, and William III of England; she sold three pieces to the King of Poland. Despite the fact that her skillfully executed paintings of flowers were sought out by Dutch and other collectors, she was denied membership in the painters' guild, because women were not allowed to join.