The University of Buenos Aires (Spanish: Universidad de Buenos Aires, UBA) is a public research university in Buenos Aires, Argentina. Established in 1821, it is the premier institution of higher learning in the country and one of the most prestigious universities of Ibero-America and the world. It has educated 17 Argentine presidents, produced four of the country's five Nobel Prize laureates, and is responsible for approximately 40% of the country's research output. The QS World University Rankings currently places the UBA at number 66 in the world.