Francisco Pérez del Río, 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, is an important source for the study of 17th-century practice in Spain. He is described by some as the "Vasari of Seville": vocal and didactic about his theories of painting and thoughts about painters, conventional and uninspired in his executions.