Winter Diary (Spanish: Diario de invierno)[1] is a 1988 Spanish film directed by Francisco Regueiro which stars Fernando Rey and Eusebio Poncela in a father-son relation alongside Francisco Algora, Terele Pávez, Rosario Flores, Lilí Murati, and Victoria Peña.

The plot tracks a policy agent seeking evidence for the criminal activities of his father, a former healer who practices euthanasia to people in need of relief.

[2] The film was presented in September 1988 at the 36th San Sebastián International Film Festival.

[6] Octavi Martí of El País wrote that Winter Diary is "an extremely ambitious and risky film, which produces a strange sensation of lack of footage".

[4] The review in Fotogramas rated the film 3 out of 5 stars, deeming it to be "an attractive film displaying a hermeticism that ends up becoming excessive", underpinning a game with "puzzling but suggestive results".