To fill the absence of his six-year-old daughter living in Berlin, a Montreal filmmaker keeps a film diary which takes him back to his relationship with his adoptive father and his biological father, whom he never knew. His diary also becomes a reflection on cinema by revisiting the work of filmmakers who influenced him such as Ingmar Bergman and Wim Wenders. Diary of a Father is a poetic response to making the separation between a father and his child bearable.