South America
- Argentina
- President - Pedro Eugenio Aramburu, President of Argentina (1955–1958)
- Bolivia
- President - Hernán Siles Zuazo, President of Bolivia (1956–1960)
- Brazil
- President - Juscelino Kubitschek, President of Brazil (1956–1961)
- Chile
- President - Carlos Ibáñez del Campo, President of Chile (1952–1958)
- Colombia
- Head of State -
- Gustavo Rojas Pinilla, President of Colombia (1953–1957)
- Gabriel París Gordillo, Chairman of the Military Junta of Colombia (1957–1958)
- Head of State -
- Ecuador
- President - Camilo Ponce Enríquez, President of Ecuador (1956–1960)
- Paraguay
- President - Alfredo Stroessner, President of Paraguay (1954–1989)
- Peru
- President - Manuel Prado Ugarteche, President of Peru (1956–1962)
- Prime Minister - Manuel Cisneros Sánchez, President of the Council of Ministers of Peru (1956–1958)
- Uruguay
- Head of State -
- Alberto Fermín Zubiría, President of the National Council of Government of Uruguay (1956–1957)
- Arturo Lezama, President of the National Council of Government of Uruguay (1957–1958)
- Head of State -
- Venezuela
- President - Marcos Pérez Jiménez, President of Venezuela (1952–1958)
Read more about this topic: List Of State Leaders In 1957
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