St. Thomas Aquinas

Summa Theologica

Image of St. Thomas Aquinas

Literally translated by Fathers of the English Dominican Province. Second and Revised Edition, 1920.

Every so often you may need a printed copy of a particular article or question from the Summa Theologica. On this site, you will find PDF versions of every question and every article of the Summa Theologica suitable for printing.

In order to view the files, you will need a program or plug-in which can read PDF, such as the free Adobe Reader or Preview (for Mac OS X).

The Summa Theologica of St. Thomas Aquinas
[Letter] [A4] Prologue
Ia  First Part
Ia IIae  First Part of the Second Part
IIa IIae  Second Part of the Second Part
IIIa  Third Part
Suppl. IIIae  Supplement and Appendices
[Letter] [A4] Complete text as a single PDF file (13.3 MB).

Please note that these web pages and PDF files are still under some development. Text in Greek is tranliterated into the Roman alphabet. The divisions of treatises in the later parts needs work.

Other Editions

Thomas More, now part of Ave Maria Press, publishes the Summa Theologica in a five-volume set, paperback or hardcover.

Online versions of the Summa Theologica are also available at:

The web versions are great for reading, but not for printing.

The PDF files on this site were generated from an XML source file in the OSIS format available at CCEL. The source file was produced through the kindness of Sandra K. Perry, Perrysburg, Ohio. More production information is available in the colophon