Franz Marijnen (4 April 1943 – 3 August 2022) was a Belgian theatre director. His early career, in the Netherlands and Belgium, was influenced by the work of the Polish theatre director and theorist Jerzy Grotowski. Marijnen then moved to the United States where he 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 theatres in the Netherlands and Belgium, including the Ro Theatre in Rotterdam and the KVS in Brussels.