Pope St. Pius X (August 4, 1903 – August 20, 1914)
- Acerbo Nimis (On Teaching Christian Doctrine) - April 15, 1905 Ereader Files: English [ MOBI- EPUB- ]
- Ad Diem Illum Laetissimum (On the Immaculate Conception) - February 2, 1904 Ereader Files: English [ MOBI- EPUB- ]
- Communium Rerum (On St. Anselm of Aosta) - April 21, 1909 Ereader Files: English [ MOBI- EPUB- ]
- Divino Afflatu (Reform of the Roman Breviary) - November 1, 1911 Ereader Files: Latin [ MOBI- EPUB- ]
- E Supremi (On the Restoration of All things in Christ) - October 4, 1903 Ereader Files: English [ MOBI- EPUB- ]
- Editae Saepe (On St. Charles Borromeo) - May 26, 1910 Ereader Files: English [ MOBI- EPUB- ]
- FOR THE FIFTIETH ANNIVERSARY OF THE PROCLAMATION OF THE DOGMA OF THE IMMACULATE CONCEPTION () - December 12, 1904 Ereader Files: English [ MOBI- EPUB- ]
- Gravissimo Officii Munere (On French Associations of Worship) - August 10, 1906 Ereader Files: English [ MOBI- EPUB- ]
- Haerent Animo () - August 4, 1908 Ereader Files: English [ MOBI- EPUB- ]
- Iamdudum (On the Law of Separation in Portugal) - May 24, 1911 Ereader Files: English [ MOBI- EPUB- ]
- Il Fermo Proposito (On Catholic Action in Italy) - June 11, 1905 Ereader Files: English [ MOBI- EPUB- ]
- Iucunda Sane (On Pope Gregory the Great) - March 12, 1904 Ereader Files: English [ MOBI- EPUB- ]
- Lacrimabili Statu (On the Indians of South America) - June 7, 1912 Ereader Files: English [ MOBI- EPUB- ]
- Lamentabili Sane () - July 3, 1907 Ereader Files: English [ MOBI- EPUB- ]
- Notre Charge Apostolique (Our Apostolic Mandate) - August 15, 1910 Ereader Files: English [ MOBI- EPUB- ]
- Pascendi Dominici Gregis (On the Doctrine of the Modernists) - September 8, 1907 Ereader Files: English [ MOBI- EPUB- ] Spanish [ MOBI- EPUB- ]
- Pieni L’animo (On the Clergy in Italy) - July 28, 1906 Ereader Files: English [ MOBI- EPUB- ]
- Pope St. Pius X () - April 20, 1914 Ereader Files: Latin [ MOBI- EPUB- ] English [ MOBI- EPUB- ]
- Praestantia Scripturae (On the Bible Against the Modernists) - November 18, 1907 Ereader Files: English [ MOBI- EPUB- ]
- Quam Singulari () - August 8, 1910 Ereader Files: English [ MOBI- EPUB- ]
- Septimo Iam ((Resolving certain controversies among the Orders of Friars Minor) Latin/English parallel texts) - October 4, 1909 Ereader Files: English [ MOBI- EPUB- ] Latin [ MOBI- EPUB- ]
- Singulari Quadam (On Labor Organizations) - Ereader Files: English [ MOBI- EPUB- ]
- The Oath Against Modernism () - September 1, 1910 Ereader Files: English [ MOBI- EPUB- ]
- Tra Le Sollecitudini ((On Sacred Music)) - November 22, 1903 Ereader Files: Arabic [ MOBI- EPUB- ]
- Tribus Circiter (On the Miravites: Mystic Priests of Poland) - April 5, 1906 Ereader Files: English [ MOBI- EPUB- ]
- Une Fois Encore (On the Separation of Church and State) - January 6, 1907 Ereader Files: English [ MOBI- EPUB- ]
- Vehementer Nos (On the French Law of Separation) - February 11, 1906 Ereader Files: English [ MOBI- EPUB- ]