Jose Nicolás Baltasar Fernández de Piérola y Villena (known as "El Califa" ("The Caliph"); January 5, 1839 – June 23, 1913) was a Peruvian politician and finance minister who served as the 33rd and 39th President of the Republic of Peru, from 1879 to 1881 and 1895 to 1899.