Ademar Pereira de Barros (22 April 1901 – 12 March 1969) was the mayor of São Paulo (1957–1961), and twice elected Governor of São Paulo (1947–1951 & 1963–1966). Barros was born in Piracicaba, Brazil. He was the federal interventor in the state of São Paulo nominated by Brazilian dictator Getúlio Vargas, serving between 1938 and 1941.