Casa de los Mascarones, Colonial building in Santa María la Ribera, Mexico City, Mexico

Casa de los Mascarones is an unfinished colonial house on Avenida Ribera de San Cosme in Santa María la Ribera, begun between 1766 and 1771 as a country estate for José Diego Hurtado de Mendoza, count of the Valle de Orizaba. Its stone facade carries carved masks that give the building its name, and works between 1941 and 1944 revealed aspects of its 19th-century appearance.

Construction of the house began between 1766 and 1771 for José Diego Hurtado de Mendoza, Peredo y Vivero, Count of the Valley of Orizaba, but it was left unfinished. It remained abandoned until 1822, when it was auctioned; canon Manuel Moreno y Jove later completed it with unknown plans. From 1850 it housed schools, and in 1914 President Venustiano Carranza nationalized it, expelling the Jesuits.

The house takes its name from the stone masks, or mascarones, carved on its facade. The building later housed schools and, from 1929, the Escuela de Música and summer courses of the National University. Today it is a declared historic monument.

The building is easily accessible from the street as it sits directly along a major avenue within walking distance. The nearby Metro stations at Normal and San Cosme are both close enough to reach on foot.

The facade displays 36 different stone masks, each with distinct facial expressions and decorative patterns. This large number of individual carved faces makes the building quite unusual among colonial structures.