John Paul II: Redemptoris Mater
Encyclical "Mother of the Redeemer," promulgated 25 March, 1987. A reflection on the role of the Blessed Virgin Mary in the life of the Church. 166K.
Leo XIII: Iucunda Semper Expectatione
http://www.vatican.va/holy_father/leo_xiii/encyclicals/documents/hf_l-xiii_enc_08091894_iucunda-semp
On the Rosary. Also touches on Mary's role in pointing people to God. Encyclical promulgated 8 September, 1894.
Leo XIII: Octobri Mense
On the Rosary. Encyclical promulgated 22 September 1891.
Leo XIII: Vi è Ben Noto
http://www.vatican.va/holy_father/leo_xiii/encyclicals/documents/hf_l-xiii_enc_20091887_vi-e-ben-not
Addressed to the bishops of Italy. Begs them to encourage praying the rosary for the pope in his hour of need. Encyclical promulgated 20 September, 1887.
Paul VI: Christi Matri
On Prayers to Mary for Peace. Encyclical promulgated 15 September, 1966.
Paul VI: Mense Maio
On the Occasion of the First of May. Encyclical promulgated 30 April, 1965.
Paul VI: Signum Magnum
Encyclical promulgated 13 May, 1967. About the spiritual motherhood of Mary, urges imitation of her virtues.
Pius XI: Ingravescentibus Malis
On the Rosary. Encyclical promulgated on 29 September 1937.
Pius XI: Lux Veritatis
Encyclical on the Council of Ephesus, which condemned the Nestorian heresy. Promulgated 25 December, 1931.
Pius XII: Ad Caeli Reginam
On Proclaiming the Queenship of Mary. Encyclical promulgated on 11 October 1954.
Pius XII: Deiparae Virginis Mariae
Encyclical promulgated on 1 May 1946. Asks the bishops to pray about whether the Assumption of Mary should be defined as dogma.
Pius XII: Fulgens Corona
Proclaiming a Marian Year to commemorate the centenary of the definition of the dogma of the Immaculate Conception. Encyclical promulgated on 8 September 1953.
Pius XII: Munificentissimus Deus
Apostolic Constitution, November 1, 1950, on proclaiming the dogma of the Assumption.