The Antiguo Colegio de San Ildefonso is a museum in Mexico City, located in the Historic Centre of Mexico City, at number 16 Justo Sierra Street.
Dedicated to temporary exhibitions, it also has its own collection, forged when it was an important Jesuit school and when it was the seat of the National Preparatory School of the National University of Mexico, between 1867 and 1989, in addition to the outstanding set of murals painted on its walls between 1922 and 1940 by the most outstanding artists of Mexican muralism.