Valérie Donzelli is a French actress, filmmaker and screenwriter. She has directed six feature films and two short films since 2008, including the film Declaration of War (2011).

Declaration of War is a 2011 French film directed by Valérie Donzelli, and written by and starring Donzelli and Jérémie Elkaïm; it is based on actual events in their lives together, when they were a young couple caring for their dangerously ill son. It was released on the 31 August 2011 and received very positive reviews; Allociné, a review aggregation website gave it an average of 4.3 stars out of five. Le Monde gave it a full five stars, saying "Against cancer, an undoubtable force of happiness". The film was selected as the French entry for the Best Foreign Language Film at the 84th Academy Awards, but it did not make the final shortlist.