René Barrientos Ortuño was a Bolivian military officer and politician who served as the 47th president of Bolivia twice nonconsecutively from 1964 to 1966 and from 1966 to 1969. During much of his first term, he shared power as co-president with Alfredo Ovando from 1965 to 1966 and prior to that served as the 30th vice president of Bolivia in 1964.

Bolivia, officially the Plurinational State of Bolivia, is a landlocked country located in western-central South America. It is bordered by Brazil to the north and east, Paraguay to the southeast, Argentina to the south, Chile to the southwest, and Peru to the west. The seat of government and administrative capital is La Paz, which contains the executive, legislative, and electoral branches of government, while the constitutional capital is Sucre, the seat of the judiciary. The largest city and principal industrial center is Santa Cruz de la Sierra, located on the Llanos Orientales, a mostly flat region in the east of the country.