Pope Leo XIII (February 20, 1878 – July 20, 1903)
- Ad Extremas (Seminaries for Native Clergy) - June 24, 1893 Ereader Files: English [ MOBI- EPUB- ]
- Adiutricem (On the Rosary) - September 5, 1895 Ereader Files: English [ MOBI- EPUB- ]
- Aeterni Patris (On the Restoration of Christian Philosophy) - August 4, 1879 Ereader Files: English [ MOBI- EPUB- ]
- Affari Vos (On the Manitoba School Question) - December 8, 1897 Ereader Files: English [ MOBI- EPUB- ]
- Amantissimae Voluntatis (To the English People) - April 27, 1895 Ereader Files: English [ MOBI- EPUB- ]
- Annum Sacrum (Consecration to the Sacred Heart) - May 25, 1899 Ereader Files: English [ MOBI- EPUB- ]
- Apostolicae Curae (On the Nullity of Anglican Orders) - September 15, 1896 Ereader Files: English [ MOBI- EPUB- ]
- Arcanum (On Christian Marriage) - February 10, 1880 Ereader Files: English [ MOBI- EPUB- ]
- Au Milieu Des Sollicitudes (On the Church and State in France) - February 16, 1892 Ereader Files: English [ MOBI- EPUB- ]
- Augustissimae Virginis Mariae (On the Confraternity of the Holy Rosary) - September 12, 1897 Ereader Files: English [ MOBI- EPUB- ]
- Auspicato Concessum (On St. Francis of Assisi) - September 17, 1882 Ereader Files: English [ MOBI- EPUB- ]
- Caritatis Studium (On the Church in Scotland) - June 25, 1898 Ereader Files: English [ MOBI- EPUB- ]
- Catholicae Ecclesiae (On Slavery in the Missions) - November 20, 1890 Ereader Files: English [ MOBI- EPUB- ]
- Christi Nomen (On Propogation of the Faith and Eastern Churches) - December 24, 1894 Ereader Files: English [ MOBI- EPUB- ]
- Constanti Hungarorum (On the Church in Hungary) - September 2, 1893 Ereader Files: English [ MOBI- EPUB- ]
- Cum Multa (On Conditions in Spain) - December 8, 1882 Ereader Files: English [ MOBI- EPUB- ]
- Custodi Di Quella Fede (On Freemasonry) - November 8, 1892 Ereader Files: English [ MOBI- EPUB- ]
- Dall’alto Dell’apostolico Seggio (On Freemasonry in Italy) - October 15, 1890 Ereader Files: English [ MOBI- EPUB- ]
- Depuis Le Jour (On the Education of the Clergy) - September 8, 1899 Ereader Files: English [ MOBI- EPUB- ]
- Diuturni Temporis (On the Rosary) - September 5, 1898 Ereader Files: English [ MOBI- EPUB- ]
- Diuturnum (On the Origin of Civil Power) - June 29, 1881 Ereader Files: English [ MOBI- EPUB- ]
- Divinum Illud Munus (On the Holy Spirit Divinum) - May 9, 1897 Ereader Files: English [ MOBI- EPUB- ]
- Dum Multa (Marriage Legislation) - December 24, 1902 Ereader Files: English [ MOBI- EPUB- ]
- Etsi Cunctas (On the Church in Ireland) - December 21, 1888 Ereader Files: English [ MOBI- EPUB- ]
- Etsi Nos (On Conditions in Italy) - February 15, 1882 Ereader Files: English [ MOBI- EPUB- ]
- Exeunte Iam Anno (On Right Ordering of Christian Life) - December 25, 1888 Ereader Files: English [ MOBI- EPUB- ]
- Fidentem Piumque Animum (On the Rosary) - September 20, 1896 Ereader Files: English [ MOBI- EPUB- ]
- Fin Dal Principio (On the Education of the Clergy) - December 8, 1902 Ereader Files: English [ MOBI- EPUB- ]
- Grande Munus (On Saints Cyril and Methodius) - September 30, 1880 Ereader Files: English [ MOBI- EPUB- ]
- Graves De Communi Re (On Christian Democracy) - January 18, 1901 Ereader Files: English [ MOBI- EPUB- ]
- Gravissimas (On Religious Orders in Portugal) - May 16, 1901 Ereader Files: English [ MOBI- EPUB- ]
- Humanum Genus (On Freemasonry) - April 20, 1884 Ereader Files: English [ MOBI- EPUB- ]
- Iampridem (On Catholicism in Germany) - January 6, 1886 Ereader Files: English [ MOBI- EPUB- ]
- Immortale Dei (On the Christian Constitution of States) - November 1, 1885 Ereader Files: English [ MOBI- EPUB- ]
- In Amplissimo (On the Church in the United States) - April 15, 1902 Ereader Files: English [ MOBI- EPUB- ]
- In Ipso (On Episcopal Reunions in Austria) - March 3, 1891 Ereader Files: English [ MOBI- EPUB- ]
- In Plurimis (On the Abolition of Slavery) - May 5, 1888 Ereader Files: English [ MOBI- EPUB- ]
- Inimica Vis (On Freemasonry) - December 8, 1892 Ereader Files: English [ MOBI- EPUB- ]
- Inscrutabili Dei Consilio (On the Evils of Society) - April 21, 1878 Ereader Files: English [ MOBI- EPUB- ]
- Insignes (On the Hungarian Millenium) - May 1, 1896 Ereader Files: English [ MOBI- EPUB- ]
- Iucunda Semper Expectatione (On the Rosary) - September 8, 1894 Ereader Files: English [ MOBI- EPUB- ]
- Laetitiae Sanctae (Commending Devotion to the Rosary) - September 8, 1893 Ereader Files: English [ MOBI- EPUB- ]
- Libertas Praestantissimum (On the Nature of Human Liberty) - June 20, 1888 Ereader Files: English [ MOBI- EPUB- ]
- Licet Multa (On Catholics in Belgium) - August 3, 1881 Ereader Files: English [ MOBI- EPUB- ]
- Litteras A Vobis (On the Clergy in Brasil) - July 2, 1894 Ereader Files: English [ MOBI- EPUB- ]
- Longinqua (On Catholicism in the United States) - January 6, 1895 Ereader Files: English [ MOBI- EPUB- ]
- Magnae Dei Matris (On the Rosary) - September 8, 1892 Ereader Files: English [ MOBI- EPUB- ]
- Magni Nobis (On the Catholic University of America) - March 7, 1889 Ereader Files: English [ MOBI- EPUB- ]
- Militantis Ecclesiae (On St. Peter Canisius) - August 1, 1897 Ereader Files: English [ MOBI- EPUB- ]
- Mirae Caritatis (On the Holy Eucharist) - May 28, 1902 Ereader Files: English [ MOBI- EPUB- ]
- Misericors Dei Filius (Constitution On the Law of the Franciscan third Order secular) - May 30, 1883 Ereader Files: English [ MOBI- EPUB- ] Latin [ MOBI- EPUB- ]
- Nobilissima Gallorum Gens (On the Religious Question in France) - February 8, 1884 Ereader Files: English [ MOBI- EPUB- ]
- Octobri Mense (On the Rosary) - September 22, 1891 Ereader Files: English [ MOBI- EPUB- ]
- Officio Sanctissimo (On the Church in Bavaria) - December 22, 1887 Ereader Files: English [ MOBI- EPUB- ]
- Omnibus Compertum (On Unity Among the Greek) - July 21, 1900 Ereader Files: English [ MOBI- EPUB- ]
- Orientalium Dignitas (On the Churches of the East) - November 30, 1894 Ereader Files: English [ MOBI- EPUB- ]
- Pastoralis (On Religious Union) - June 25, 1891 Ereader Files: English [ MOBI- EPUB- ]
- Pastoralis Officii (On the Morality of Dueling) - September 12, 1891 Ereader Files: English [ MOBI- EPUB- ]
- Paternae (On the Education of the Clergy) - September 18, 1899 Ereader Files: English [ MOBI- EPUB- ]
- Pergrata (On the Church in Portugal) - September 14, 1886 Ereader Files: English [ MOBI- EPUB- ]
- Permoti Nos (On Social Conditions in Belgium) - July 10, 1895 Ereader Files: English [ MOBI- EPUB- ]
- Praeclara Gratulationis Publicae (The Reunion of Christendom) - June 20, 1894 Ereader Files: English [ MOBI- EPUB- ]
- Providentissimus Deus (On the Study of Holy Scripture) - November 18, 1893 Ereader Files: English [ MOBI- EPUB- ]
- Quae Ad Nos (On the Church in Bohemia and Moravia) - November 22, 1902 Ereader Files: English [ MOBI- EPUB- ]
- Quam Aerumnosa (On Italian Immigrants) - December 10, 1888 Ereader Files: English [ MOBI- EPUB- ]
- Quam Religiosa (On Civil Marriage Law) - August 16, 1898 Ereader Files: English [ MOBI- EPUB- ]
- Quamquam Pluries (On Devotion to St. Joseph) - August 15, 1889 Ereader Files: English [ MOBI- EPUB- ]
- Quarto Abeunte Saeculo (On Christopher Columbus) - July 16, 1892 Ereader Files: English [ MOBI- EPUB- ]
- Quod Anniversarius (On His Sacerdotal Jubilee) - April 1, 1888 Ereader Files: English [ MOBI- EPUB- ]
- Quod Apostolici Muneris (On Socialism) - December 28, 1878 Ereader Files: English [ MOBI- EPUB- ]
- Quod Auctoritate (Proclaiming a Jubilee) - December 22, 1885 Ereader Files: English [ MOBI- EPUB- ]
- Quod Multum (On the Liberty of the Church) - August 22, 1886 Ereader Files: English [ MOBI- EPUB- ]
- Quod Votis (On the Proposed Catholic University) - April 30, 1902 Ereader Files: French [ MOBI- EPUB- ]
- Quum Diuturnum (On the Latin American Bishops' Plenary Council) - December 25, 1898 Ereader Files: English [ MOBI- EPUB- ]
- Reputantiubus (On the Language Question in Bohemia) - August 20, 1901 Ereader Files: English [ MOBI- EPUB- ]
- Rerum Novarum (On Capital and Labor) - May 15, 1891 Ereader Files: English [ MOBI- EPUB- ]
- Saepe Nos (On Boycotting in Ireland) - June 24, 1888 Ereader Files: English [ MOBI- EPUB- ]
- Sancta Dei Civitas (On Mission Societies) - December 3, 1880 Ereader Files: English [ MOBI- EPUB- ]
- Sapientiae Christianae (On Christians as Citizens) - January 10, 1890 Ereader Files: English [ MOBI- EPUB- ]
- Satis Cognitum (On the Unity of the Church) - June 29, 1896 Ereader Files: English [ MOBI- EPUB- ]
- Spectata Fides (On Christian Education) - November 27, 1885 Ereader Files: English [ MOBI- EPUB- ]
- Spesse Volte (On the Suppression of Catholic Institutions) - August 5, 1898 Ereader Files: English [ MOBI- EPUB- ]
- Superiore Anno (On the Recitation of the Rosary) - August 30, 1884 Ereader Files: English [ MOBI- EPUB- ]
- Supremi Apostolatus Officio (On Devotion to the Rosary) - September 1, 1883 Ereader Files: English [ MOBI- EPUB- ]
- Tametsi Futura Prospicientibus (On Jesus Christ the Redeemer) - November 1, 1900 Ereader Files: English [ MOBI- EPUB- ]
- Testem Benevolentiae Nostrae (Concerning New Opinions, Virtue, Nature and Grace, With Regard to Americanism) - January 22, 1899
- Urbanitatis Veteris (On the Foundation of a Seminary in Athens) - November 20, 1901 Ereader Files: English [ MOBI- EPUB- ]
- Vi E Ben Noto (On the Rosary and Public Life) - September 20, 1887 Ereader Files: English [ MOBI- EPUB- ]