The National University of San Marcos (, UNMSM) is a public university in Lima, Peru. It was founded on 12 May 1551. It is the first and most important university of Peru and the oldest university of the Americas. The University of San Marcos has 20 faculties and 62 academic schools. It enrolls 28,645 undergraduate students and 3,447 graduate students. The National University of San Marcos has many notable students and graduates, including the only Peruvian Nobel Prize winner, Mario Vargas Llosa. Academically, the University of San Marcos ranks first in Peru.