Juan Carlos Onganía Carballo (Spanish pronunciation: ['xwa? 'ka?los o?ga'ni.a]; March 17, 1914 – June 8, 1995) was de facto President of Argentina from 29 June 1966 to 8 June 1970.
He rose to power as military dictator after toppling the president Arturo Illia in a coup d'état self-named Revolución Argentina (Argentine Revolution).
(Although Peronism - the chief political force in Argentina at the time - was proscribed, Illia's UCR was generally seen as legitimately elected.)