Julio Antonio Gastón Durán Neumann (20 March 1918 – 27 November 1990), was a Chilean lawyer and politician. He ran for President in 1964 against Eduardo Frei Montalva and Salvador Allende. He was a member of the Radical Democracy Party, which advocated ideas taken from Classical liberalism and Radicalism. Duran was a State Deputy (1945–1957) and State Senator (1957–1973).