The Algerian War, also known as the Algerian War of Independence or the Algerian Revolution (Berber: Tagrawla Tadzayrit; Arabic: الثورة الجزائرية‎ Al-thawra Al-Jazaa'iriyya; French: Guerre d'Algérie or Révolution algérienne) was a war between France and the Algerian independence movements from 1954 to 1962, which led to Algeria gaining its independence from France. An important decolonization war, it was a complex conflict characterized by guerrilla warfare, maquis fighting, terrorism, the use of torture by both sides, and counter-terrorism operations. The conflict was also a civil war between loyalist Algerians supporting a French Algeria and their insurrectionist Algerian nationalist counterparts.

Effectively started by members of the National Liberation Front (FLN) on November 1, 1954, during the Toussaint Rouge ("Red All Saints' Day"), the conflict shook the foundations of the weak and unstable Fourth French Republic (1946–58) and led to its replacement by the Fifth Republic with a strengthened Presidency, with Charles de Gaulle acting in the latter role. Although the military campaigns greatly weakened the FLN militarily, with most prominent FLN leaders killed or arrested and terror attacks effectively stopped, the brutality of the methods employed failed to win hearts and minds in Algeria, alienated support in Metropolitan France and discredited French prestige abroad.