Pope Pius XI (February 6, 1922 – February 10, 1939)
- Acerba animi (On the Persecution of the Church in Mexico) - September 29, 1932 Ereader Files: English [ MOBI- EPUB- ]
- Ad Catholici Sacerdotii (On the Catholic Priesthood) - December 20, 1935 Ereader Files: English [ MOBI- EPUB- ]
- Ad Salutem (On St. Augustine) - April 30, 1930 Ereader Files: English [ MOBI- EPUB- ]
- Apostolicorum in Missionibus (Decree naming St. Therese co-patron along with St. Francis Xavier of all foreign missions) - December 14, 1927 Ereader Files: Latin [ MOBI- EPUB- ]
- Caritate Christi Compulsi (On the Sacred Heart) - May 3, 1932 Ereader Files: English [ MOBI- EPUB- ]
- Casti Connubii (On Christian Marriage) - December 31, 1930 Ereader Files: English [ MOBI- EPUB- ]
- Dilectissima Nobis (On the Persecution of the Church in Spain) - June 3, 1933 Ereader Files: English [ MOBI- EPUB- ]
- Divini Illius Magistri (On Christian Education) - December 31, 1929 Ereader Files: English [ MOBI- EPUB- ]
- Divini Redemptoris (On Atheistic Communism) - March 19, 1937 Ereader Files: English [ MOBI- EPUB- ]
- Ecclesiam Dei (On St. Jehosophat) - November 12, 1923 Ereader Files: English [ MOBI- EPUB- ]
- Ingravescentibus Malis (On the Rosary) - September 29, 1937 Ereader Files: English [ MOBI- EPUB- ]
- Iniquis Afflictisque (On the Persecution of the Church in Mexico) - November 18, 1926 Ereader Files: English [ MOBI- EPUB- ]
- Lux Veritatis (On the Council of Ephesus) - December 25, 1931 Ereader Files: English [ MOBI- EPUB- ]
- Maximam Gravissimamque (On French Diocesan Association) - January 18, 1924 Ereader Files: English [ MOBI- EPUB- ]
- Mens Nostra (Promotion of the Spiritual Exercises) - December 20, 1929 Ereader Files: English [ MOBI- EPUB- ]
- Miserentissimus Redemptor (Reparation to the Sacred Heart) - May 8, 1928 Ereader Files: English [ MOBI- EPUB- ]
- Mit Brennender Sorge (On the Church and the German Reich) - March 14, 1937 Ereader Files: English [ MOBI- EPUB- ]
- Mortalium Animos (On Religious Unity) - January 6, 1928 Ereader Files: English [ MOBI- EPUB- ]
- Non Abbiamo Bisogno (Catholic Action in Italy) - June 29, 1931 Ereader Files: English [ MOBI- EPUB- ]
- Nos Es Muy Conocida (On the Religious Situation in Mexico) - March 28, 1937 Ereader Files: English [ MOBI- EPUB- ]
- Nova Impendet (On the Economic Crisis) - October 2, 1931 Ereader Files: English [ MOBI- EPUB- ]
- Quadragesimo Anno (Reconstruction of the Social Order) - May 15, 1931 Ereader Files: English [ MOBI- EPUB- ]
- Quas Primas (Introducing the Feast of Christ the King) - December 11, 1925 Ereader Files: English [ MOBI- EPUB- ]
- Quinquagesimo Ante (On his Sacred Jubilee) - December 23, 1929 Ereader Files: English [ MOBI- EPUB- ]
- Rerum condicio (Apostolic Constitution reforming the Rule of the Third Order Regular) - October 4, 1927 Ereader Files: English [ MOBI- EPUB- ] Latin [ MOBI- EPUB- ]
- Rerum Ecclesiae (On Catholic Missions) - February 8, 1926 Ereader Files: English [ MOBI- EPUB- ]
- Rerum Omnium Perturbationem (St. Francis De Salles) - January 26, 1923 Ereader Files: English [ MOBI- EPUB- ]
- Rerum Orientalium (On the Promotion of Oriental Studies) - September 8, 1928 Ereader Files: English [ MOBI- EPUB- ]
- Rite Expiatis (On St. Francis of Assisi) - April 13, 1926 Ereader Files: English [ MOBI- EPUB- ]
- Studiorum Ducem (On St. Thomas Aquinas) - June 29, 1923 Ereader Files: English [ MOBI- EPUB- ]
- Ubi Arcano Dei Consilio (On the Peace of Christ in HIs Kingdom) - December 23, 1922 Ereader Files: English [ MOBI- EPUB- ]
- Vigilanti Cura (On Motion Pictures) - June 29, 1936 Ereader Files: English [ MOBI- EPUB- ]