Supremi Apostolatus Officio
- Encyclical promulgated September 1, 1883. Testifies to the rosary's venerability and power, and exhorts the faithful to its frequent use.
- http://www.newadvent.org/library/docs_le13so.htm

Superiore Anno
- On the recitation of the rosary. Previous year's October Marian devotions judged a success. Also mentions cholera epidemic then sweeping France and Italy. Encyclical promulgated 30 August, 1884.
- http://www.newadvent.org/library/docs_le13sa.htm

Laetitiae Sanctae
- Says that meditation on each set of mysteries of the rosary remedies a specific danger in modern society. Encyclical promulgated 8 September, 1893.
- http://www.newadvent.org/library/docs_le13ls.htm

Prayer to St. Michael the Archangel
- Taken from a 1935 Raccolta. The prayers to St. Michael, as composed by Leo XIII.
- http://www.solt3.org/exorcism1.htm

Vi è Ben Noto
- 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.
- http://www.vatican.va/holy_father/leo_xiii/encyclicals/documents/hf_l-xiii_enc_20091887_vi-e-ben-noto_en.html

Iucunda Semper Expectatione
- On the Rosary. Also touches on Mary's role in pointing people to God. Encyclical promulgated 8 September, 1894.
- http://www.vatican.va/holy_father/leo_xiii/encyclicals/documents/hf_l-xiii_enc_08091894_iucunda-semper-expectatione_en.html

Apostolicae Curae
- Papal bull on the nullity of Anglican orders, issued 18 September, 1896. Pronounces Anglican ordinations "absolutely null and utterly void."
- http://www.papalencyclicals.net/Leo13/l13curae.htm

Quarto Abeunte Saeculo
- Encyclical issued on the occasion of the Columbus Quadricentennial, in 1892. Paints Christopher Columbus as an exemplary Catholic motivated by a desire to advance the Christian faith.
- http://www.papalencyclicals.net/Leo13/l13col.htm

Providentissimus Deus
- Encyclical on the study of Holy Scripture. Promulgated 18 November, 1893. In former times, the Church had to contend with private interpretation, but now Catholics must also refute those who deny revelation. All in one file, 63K.
- http://www.papalencyclicals.net/Leo13/l13provi.htm

Aeterni Patris
- On the Restoration of Christian Philosophy. Encyclical promulgated 4 August, 1879. Philosophy can be a powerful aid to apologetics and theology. Commends Scholasticism in particular.
- http://www.papalencyclicals.net/Leo13/l13cph.htm

Magnae Dei Matris
- Encyclical promulgated 8 September, 1892. Commends the rosary for its power to increase love for Christ, and to inspire a virtuous life.
- http://www.papalencyclicals.net/Leo13/l13ro2.htm

Quamquam Pluries
- Encyclical on devotion to St. Joseph, promulgated on August 15, 1889.
- http://www.papalencyclicals.net/Leo13/l13jos.htm

Auspicato Concessum
- On St. Francis of Assisi. Encyclical promulgated 17 September, 1882.
- http://www.papalencyclicals.net/Leo13/l13frc.htm

Grande Munus
- Encyclical on SS. Cyril and Methodius, promulgated 30 September, 1880.
- http://www.papalencyclicals.net/Leo13/l13cym.htm

Quod Apostolici Muneris
- Encyclical on socialism. Promulgated 28 December, 1878. Condemns socialism, communism, and nihilism as a "wicked confederacy."
- http://www.vatican.va/holy_father/leo_xiii/encyclicals/documents/hf_l-xiii_enc_28121878_quod-apostolici-muneris_en.html

Paterna Caritas
- Encyclical on reunion with Rome. Urges the Armenian Rite Catholics to be united with each other and to be shining examples of Christian life. Promulgated 25 July, 1888.
- http://www.vatican.va/holy_father/leo_xiii/encyclicals/documents/hf_l-xiii_enc_25071888_paterna-caritas_en.html

Augustissimae Virginis Mariae
- Encyclical on the Confraternity of the Rosary. Promulgated 12 September, 1897.
- http://www.vatican.va/holy_father/leo_xiii/encyclicals/documents/hf_l-xiii_enc_12091897_augustissimae-virginis-mariae_en.html

Militantis Ecclesiae
- Encyclical on St. Peter Canisius. Also praises learning. Promulgated 1 August, 1897.
- http://www.vatican.va/holy_father/leo_xiii/encyclicals/documents/hf_l-xiii_enc_01081897_militantis-ecclesiae_en.html

Dall'alto dell'Apostolico Seggio
- Encyclical on Freemasonry in Italy. Promulgated 15 October, 1890.
- http://www.vatican.va/holy_father/leo_xiii/encyclicals/documents/hf_l-xiii_enc_18901015_dall'alto-dell'apostolico-seggio_en.html

Custodi di quella fede
- Encyclical addressed to the Italian people in particular, repeats condemnation of Freemasonry. Promulgated 8 December, 1892.
- http://www.vatican.va/holy_father/leo_xiii/encyclicals/documents/hf_l-xiii_enc_08121892_custodi-di-quella-fede_en.html

Humanum Genus
- Encyclical condemning Freemasonry. Promulgated 20 April, 1884.
- http://www.trosch.org/bks/freemaso.htm