The mystical city of God is a book written in the seventeenth century by the venerable Franciscan nun Maria de Jesus de Agreda.

According to María de Agreda, the book was dictated largely by the Blessed Virgin Mary and focused on the life of the Virgin Mary and the divine plan for the creation and salvation of souls. The work alternates between the descriptions of the Trinity, the Virgin Mary is the life and spiritual guidance that she gives to the author, through which her words have been reproduced for the spiritual benefit and growth of the reader. The book describes in detail the various virtues and how the reader must live to be reflected in his own life, with the Virgin Mary as a model of holiness. The work has the approval of several Popes and Bishops, and attracts mainly those who believe in the private revelation and holiness of Mary.

Several misinterpretations of his writings led to the extent that the Mystical City of God was temporarily placed in the Index Librorum Prohibitorum of the Church in August 1681. However, by order of Blessed Innocent XI, the decree of condemnation was eliminated three months later. after it was shown that a faulty French translation was the basis of censorship.

In 1673, María de Jesús de Ágreda was declared venerable shortly after her death.