Ingravescentibus Malis
- On the Rosary. Encyclical promulgated 29 September, 1937.
- http://www.newadvent.org/library/docs_pi11im.htm

Rite Expiatis
- Encyclical about St. Francis of Assisi, promulgated 13 April, 1926.
- http://www.papalencyclicals.net/Pius11/P11RITEX.HTM

Rerum Omnium Perturbationem
- On St. Francis de Sales. Encyclical promulgated 26 January, 1923.
- http://www.papalencyclicals.net/Pius11/P11PERTU.HTM

Ad Salutem
- Encyclical on St. Augustine, promulgated on 30 April, 1930. 78K.
- http://www.papalencyclicals.net/Pius11/P11SALUT.HTM

Lux Veritatis
- Encyclical on the Council of Ephesus. Promulgated 25 December, 1931.
- http://www.ewtn.com/library/ENCYC/P11VERIT.HTM