Lázaro Cárdenas, Mexican general and politician, 44th President of Mexico (b. 1895)
Lázaro Cárdenas del Río (Spanish pronunciation: [ˈlasaɾo ˈkaɾðenas] (listen); 21 May 1895 – 19 October 1970) was a Mexican army officer and politician. He was a general in the Constitutionalist Army during the Mexican Revolution and a statesman who served as president of Mexico between 1934 and 1940. He is best known for nationalization of the oil industry in 1938 and the creation of Pemex, the government oil company. He also revived agrarian reform in Mexico, expropriating large landed estates and redistributing land to smallholders in collective holdings (ejidos).

Although he was not from the state of Sonora, whose generals had dominated Mexican politics in the 1920s, Cárdenas was loyal to Sonoran general and former president Plutarco Elías Calles (1924–1928). Calles had founded the National Revolutionary Party (PNR) in the wake of the assassination of Sonoran general Alvaro Obregón, who served as president (1920–1924) and was president-elect in 1928. Cárdenas was Calles' hand-picked candidate in 1934 to run for the presidency. While Calles did not hold the title of president, he had remained the power behind the presidency, and expected to maintain that role when Cárdenas took office. However, Cárdenas out-maneuvered him politically and eventually forced the former president into exile, establishing Cárdenas's legitimacy and power in his own right during his remaining time in office. In 1938, Cárdenas transformed the structure of the party Calles founded, creating the Partido de la Revolución Mexicana (PRM), based on sectoral representation of peasants via peasant leagues, unionized workers, professionals, and the Mexican army. Cárdenas's incorporation of the army into the party structure was a deliberate move to diminish the power of the military and prevent their traditional intervention in politics through coups d'état. An important political achievement of Cárdenas was his complete surrender of power in December 1940 to his elected successor, Manuel Ávila Camacho, who was a political moderate without a distinguished military record.

Cárdenas has been revered as "the greatest constructive radical of the Mexican Revolution", for reviving its ideals, but he has also been criticized as an "authoritarian populist". According to numerous opinion polls and analysts, Cárdenas is the most popular Mexican president of the 20th century.