Marcos Evangelista Pérez Jiménez (25 April 1914 – 20 September 2001) was a Venezuelan military officer and the dictator of Venezuela from 1950 to 1958, ruling as member of the military junta from 1950 to 1952 and as president from 1952 to 1958. He took part in the 1948 Venezuelan coup d'état, becoming part of the ruling junta. He ran in the 1952 election. However, the junta cancelled the election when early results indicated that the opposition was ahead and declared Jiménez provisional president. He became president in 1953 and instituted a constitution that granted him dictatorial powers.
Under Pérez's rule, the rise of oil prices facilitated many public works projects, including roads, bridges, government buildings and public housing, as well as the rapid development of industries such as hydroelectricity, mining and steel. He also enriched himself considerably, as well as many of his political allies. The economy of Venezuela developed rapidly while Pérez was in power. On the other hand, Pérez presided over one of the most repressive governments in Venezuela. His government's secret police, the Dirección de Seguridad Nacional (National Security Service), suppressed criticism and imprisoned those who opposed his rule.