The Escuela Nacional Preparatoria (English: National Preparatory High School) (ENP), the oldest senior High School system in Mexico, belonging to the National Autonomous University of Mexico (UNAM), opened its doors on February 1, 1868. It was founded by Gabino Barreda, M.D., following orders of then–president of Mexico Benito Juárez. It is also modern UNAM's oldest institution.

This institution's location was the Antiguo Colegio de San Ildefonso (English: San Ildefonso College), which is located in the heart of Mexico City's historic center. This college was founded in 1588 by the Jesuits and was prestigious during colonial times, but it had almost completely fallen into ruin by the time of the Reform Laws in the 1860s. These Laws secularized most of Church property, including the San Ildefonso College building. In 1867, Benito Juárez began reform of the educational system, taking it out of clerical hands and making it a government function. San Ildefonso was converted into the Escuela Nacional Preparatoria initially directed by Gabino Barreda, who organized the new school on the Positivist model of Auguste Comte (Comtism). The initial purpose of the school was to provide the nucleus of students for the soon-to-be-reconstructed Universidad Nacional (National University), later National Autonomous University of Mexico, which was re-established in 1910 by Justo Sierra.

The new preparatory school began functioning at the San Ildefonso building with more than 700 day students and 200 live-in students. The complex remained a separate entity until 1929, when the Universidad Nacional gained autonomy, meaning it became independent of the government, though still government-sponsored. The Preparatory School became part of the newly independent university system, being designated as Preparatory #1 for a short time.

Following this, because of the increasing demand, nine more schools were built, as well as a new organizational organism called General Direction. These schools were located at the center of Mexico City, but due to the increasing size of the city and the necessity for modern buildings, they were relocated in the vicinity of the city, mainly orientated in the southern neighborhoods like Coyoacán, Xochimilco and Villa Coapa.

Escuela Nacional Preparatoria

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