Deiparae Virginis Mariae Latin for 'Virgin Mary Mother of God' Encyclical of Pope Pius XII
Signature date	1 May 1946
Subject	the possibility of defining the Assumption of the Virgin Mary as a dogma of faith
Text	In Latin In English
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Immaculate Conception by Bartolomé Esteban Murillo (c. 1675)
Overview Prayers Antiphons Titles Hymns to Mary Devotional practices Saints Societies Consecrations and entrustments Veneration
Titles of Mary Theotokos (Mother of God) Mediatrix Mother of the Church Our Lady of Good Counsel Our Lady of Mount Carmel Our Lady of Sorrows Our Lady of Victory Our Lady, Star of the Sea Queen of Heaven Queen of Peace Queen of Poland Refugium Peccatorum (Refuge of Sinners) Untier of Knots Virgin of Mercy
Prayers and hymns Angelus Fátima prayers Flos Carmeli Hail Mary Hail Mary of Gold Immaculata prayer Magnificat Mary, Mother of Grace Memorare Sub tuum praesidium Marian hymns
Devotional practices Acts of Reparation Consecration to Mary First Saturdays Rosary Seven Joys of the Virgin Seven Sorrows of Mary Three Hail Marys
Movements and societies Sodality of Our Lady Congregation of Marian Fathers Company of Mary (Montfort) Marianists (Society of Mary) Marist Fathers Marist Brothers Schoenstatt Movement Legion of Mary World Apostolate of Fátima (Blue Army) Mariological Society Our Lady's Rosary Makers Marian Movement of Priests Fatima Family Apostolate Queen of Angels Foundation
Apparitions Approved, with widespread liturgical veneration endorsed by the Holy See: Fátima Three Secrets of Fátima Guadalupe Knock La Salette Lourdes Miraculous Medal Walsingham Dowry of Mary
Key Marian feast days Mother of God (1 January) Candlemas (2 February) Annunciation (25 March) Assumption (15 August) Nativity (8 September) Holy Name (12 September) Presentation (21 November) Immaculate Conception (8 December)
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Deiparae Virginis Mariae (Latin for "Virgin Mary Mother of God"), is an encyclical of Pope Pius XII released in 1946 addressed to all Catholic bishops on the possibility of defining the Assumption of the Blessed Virgin Mary as a dogma of faith.^[1][2]

The encyclical states that for a long time numerous petitions have been received from cardinals, patriarchs, archbishops, bishops, priests, religious of both sexes, associations, universities and innumerable private persons, all begging that the bodily Assumption into heaven of the Blessed Virgin should be defined and proclaimed as a dogma of faith. This was also fervently requested by almost two hundred fathers in the Vatican Council (1869–1870).

Following the example of Pope Pius IX, who with his encyclical Ubi Primum canvassed Catholic bishops before proclaiming the dogma of the Immaculate Conception, Pius XII asks all bishops for their opinion.

We earnestly beg you to inform us about the devotion of your clergy and people (taking into account their faith and piety) toward the Assumption of the most Blessed Virgin Mary. More especially We wish to know if you, Venerable Brethren, with your learning and prudence consider that the bodily Assumption of the Immaculate Blessed Virgin can be proposed and defined as a dogma of faith, and whether in addition to your own wishes this is desired by your clergy and people.^[3]