Franz Marijnen (born in Mechelen on April 4, 1943 ) is a Belgian theatre director. The beginning of his career, in the Netherlands and Belgium, was based in the work of Polish theatre director and theorist Jerzy Grotowski. He then moved to the United States and founded the experimental theatre company Camera Obscura. By the latter half of the 1970s, he was again working primarily in Europe. He served as artistic director of several large theaters in the Netherlands and Belgium, including the Ro Theater in Rotterdam and the Royal Flemish Theater in Brussels.