thumb|200px|Portrait of Francisco Pacheco (1622) by [[Diego Velázquez]]
thumb|right|200px|Francisco Pacheco, Lo Judici Final ("The Last Judgment"), Musée Goya, [[Castres, France.]]
Francisco Pérez del Río (bap. 3 November 1564 – 27 November 1644), known by his pseudonym Francisco Pacheco, was a Spanish painter, best known as the teacher of Alonso Cano and Diego Velázquez, as well as the latter's father-in-law. His textbook on painting, entitled Art of Painting, published posthumously,
Early life
He was born at Sanlúcar de Barrameda, son of Juan Pérez and Leonor del Río, and moved to Seville shortly before 1580, The couple had one daughter, Juana Pacheco (1 June 1602 – 10 August 1660).
Career
In 1559 he commenced work on his Libro de los retratos.
Pacheco's school emphasized the academically correct representation of religious subjects, not least because he was the official censor of Seville's Inquisition. His own work reflects those constraints; paintings such as the Last Judgment (convent of Santa Isabel) and Martyrs of Granada are monumental in scale but unimaginative in treatment.
In 1630, he started work on Arte de la pintura, finishing it in 1641.