Declaration of War (French: La Guerre est déclarée) 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.

[5] Le Monde gave it a full five stars, saying "Against cancer, an undoubtable force of happiness".

[6] The film was selected as the French entry for the Best Foreign Language Film at the 84th Academy Awards,[7][8] but it did not make the final shortlist.

[9] Declaration of War has an approval rating of 86% on review aggregator website Rotten Tomatoes, based on 43 reviews, and an average rating of 7.4/10.

[10] Metacritic assigned the film a weighted average score of 73 out of 100, based on 21 critics, indicating "generally favourable reviews".