Democratic Action is a Venezuelan social democratic and centre-left political party established in 1941. The party played an important role in the early years of Venezuelan democracy, leading the government during Venezuela's first democratic period (1945–1948). A decade of dictatorship under Marcos Pérez Jiménez followed, which saw AD excluded from power. With the advent of democracy in 1958, four Presidents of Venezuela came from Acción Democrática from the 1950s to the 1990s during the two-party period with COPEI.

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.