Javier Felipe Ricardo Pérez de Cuéllar y de la Guerra (January 19, 1920 – March 4, 2020) was a Peruvian diplomat who served as the 5th Secretary-General of the United Nations (UN) from 1982 to 1991. From 2000 to 2001, he served as the 135th prime minister of Peru.
In 1995, he ran unsuccessfully against Alberto Fujimori for President of Peru. He was the president of the Council of Ministers (Prime Minister), as well as Minister of Foreign Affairs, between November 2000 and July 2001, during the unstable period following Fujimori's resignation over corruption charges. In 2004, he stepped down from his position as Peru's ambassador to France.
From the death of Kurt Waldheim in 2007 until his own death in 2020, Pérez de Cuéllar was the oldest-living former secretary-general of the UN.