Dagboek van een Oude Dwaas is a 1987 Dutch film directed by Lili Rademakers. It is based on a book by the Japanese writer Jun'ichirà  Tanizaki. The film's international title is Diary of a Mad Old Man.
The film was selected for the Semaine de la Critique from the Cannes film festival in 1988.
Hamelinck, an already old man, has a severe muscle disease and must stop working. It bothers him not long, because he gets under the spell of his daughter-in-law Simone. He admired her for years already, but now overwhelms her with gifts and treats her like a queen. He acts also submissive and is delighted as he can touch her leg. Just before he dies, Hamelinck makes the wish to get Simone's footprints on his memorial stone.