Pierre Jean Marie Laval (French pronunciation: ​[pjɛʁ laval]; 28 June 1883 – 15 October 1945) was a French politician. During the Third Republic, he served as Prime Minister of France from 27 January 1931 to 20 February 1932 and again from 7 June 1935 to 24 January 1936.

A socialist early in his life, Laval became a lawyer in 1909 and was famous for his defense of strikers, trade unionists and leftists from government prosecution. In 1914, he was elected to the Chamber of Deputies as a member of the Socialist Party, and he remained committed to his pacifist convictions during the First World War. After his defeat in the 1919 election, Laval left the Socialist Party and became mayor of Aubervilliers. In 1924 he returned to the Chamber as an independent, and was elected to the Senate three years later. He also held a series of governmental positions, including Minister of Public Works, Minister of Justice and Minister of Labour. In 1931, Laval became Prime Minister, but his government fell only a year later.

Laval joined the conservative government of Gaston Doumergue in 1934 and served as Minister of the Colonies and then Foreign Minister. In 1935, Laval again became Prime Minister. Seeking to contain Germany, he pursued foreign policies favourable to Italy and the Soviet Union, but his handling of the Abyssinia Crisis, which was widely denounced as appeasement of Benito Mussolini, prompted his resignation in 1936.

After France's defeat and armistice with Germany in 1940, Laval served in prominent roles in Philippe Pétain's Vichy France, first as the vice-president of the Council of Ministers from July 1940 to December 1940 and later as the head of government from April 1942 to August 1944. The collaborationist government provided French labourers for Germany and organised the deportation of Jews.After the Liberation of France in 1944, Laval was imprisoned by the Germans. In April 1945, he fled to Spain but soon returned to France, where he was arrested by the French government under Charles de Gaulle. After what has been described as a flawed trial, Laval was found guilty of plotting against the security of the state and of collaboration with the enemy. After a thwarted suicide attempt, Laval was executed by firing squad in October 1945.Laval's manifold political activities left a complicated and controversial legacy, which resulted in more than a dozen conflicting biographies of him.