Memoirs of a Sinner (Polish: Osobisty pamiętnik grzesznika przez niego samego spisany) is a 1986 Polish film directed by Wojciech Jerzy Has, starring Piotr Bajor. The film is an adaptation of The Private Memoirs and Confessions of a Justified Sinner (1824) and tells the tale of the protagonist Robert and his doppelganger.