Divino Afflante Spiritu
- Encyclical promulgated 30 September, 1943. On Biblical studies. HTML, 61K.
- http://www.newadvent.org/library/docs_pi12da.htm

Si Diligis
- An allocution read on the occasion of the canonization of Pope St. Pius X, in 1954.
- http://ewtn.com/library/PAPALDOC/P12SIDIL.HTM

Le Pèlerinage de Lourdes
- Encyclical addressed to the bishops of France, issued during the centenary year of the apparitions of Our Lady of Lourdes.
- http://www.vatican.va/holy_father/pius_xii/encyclicals/documents/hf_p-xii_enc_02071957_le-pelerinage-de-lourdes_en.html

Munificentissimus Deus
- Apostolic Constitution, November 1, 1950, on proclaiming the dogma of the Assumption.
- http://www.ewtn.com/library/PAPALDOC/P12MUNIF.HTM

Ad Caeli Reginam
- On Proclaiming the Queenship of Mary. Encyclical promulgated on 11 October 1954.
- http://www.catholic-forum.com/saints/bvm00017.htm

Fulgens Corona
- Proclaiming a Marian Year to commemorate the centenary of the definition of the dogma of the Immaculate Conception. Encyclical promulgated on 8 September 1953.
- http://www.catholic-forum.com/saints/bvm00016.htm

Deiparae Virginis Mariae
- Encyclical promulgated on 1 May 1946. Asks the bishops to pray about whether the Assumption of Mary should be defined as dogma.
- http://www.catholic-forum.com/saints/bvm00020.htm

Orientalis Ecclesiae
- On Saint Cyril, Patriarch of Alexandria. Encyclical promulgated 9 April, 1944.
- http://www.papalencyclicals.net/Pius12/P12ORIEN.HTM

Ecclesiae Fastos
- Encyclical on St. Boniface. Promulgated 5 June, 1954.
- http://www.papalencyclicals.net/Pius12/P12FASTO.HTM

Humani Generis
- Encyclical mentions the theory of evolution and is famous for condemning polygenism. Promulgated 12 August, 1950. In HTML.
- http://www.papalencyclicals.net/Pius12/P12HUMAN.HTM

Doctor Mellifluus
- Encyclical on St. Bernard of Clairvaux, the last of the Fathers. Promulgated 24 May, 1953.
- http://www.papalencyclicals.net/Pius12/P12DOCTO.HTM

Orientales Omnes Ecclesias
- Encyclical on the 350th anniversary of the reunion of the Ruthenian Church with Rome. Promulgated 23 December, 1945.
- http://www.papalencyclicals.net/Pius12/P12OMNES.HTM

Fulgens Radiatur
- Encyclical on St. Benedict, promulgated 21 March, 1947.
- http://www.papalencyclicals.net/Pius12/P12RADIA.HTM

Haurietis Aquas
- Encyclical on devotion to the Sacred Heart of Jesus, promulgated in 1956. Says that it is beneficial for all to consider the core of this devotion, namely, gratitude for divine love.
- http://www.catholic.net/rcc/documents/PiusXII/aquas.html

Pope Pius XII's Easter Message
- April 13, 1941. Asks belligerants to spare civilians, and to refrain from escalating tactics of mass destruction.
- http://www.ibiblio.org/pha/timeline/410413bwp.html

The Service of Truth
- A letter sent by Pius XII to the Archbishop of Westminster, marking the centenary of John Henry Newman's reception into the Catholic Church.
- http://www.newmanreader.org/canonization/popes/tablet13oct45.html