El Trienio Adeco was a three-year period in Venezuelan history, from 1945 to 1948, under the government of the popular party Democratic Action. The party gained office via the 1945 Venezuelan coup d'état against President Isaías Medina Angarita, and held the first democratic elections in Venezuelan history, beginning with the 1946 Venezuelan Constituent Assembly election. The 1947 Venezuelan general election saw Democratic Action formally elected to office, but it was removed from office shortly after in the 1948 Venezuelan coup d'état.

Raúl Leoni Otero was the president of Venezuela from 1964 until 1969. He was a member of the Generation of 1928 and a charter member of the Acción Democrática party, and the first Labor minister of Venezuela.