Introduction
- Introduction to the life and writings of St. Leo the Great, from the Nicene and Post-Nicene Fathers of the Christian Church, second series, vol. 12. By Charles Lett Feltoe.
- http://www.ccel.org/ccel/schaff/npnf212.ii.iii.i.html

General Introduction
- For the Council of Chalcedon, from the Nicene and Post-Nicene Fathers of the Christian Church, second series, vol. 14. Dwells on the approval of the Tome of Leo. By Henry R. Percival.
- http://www.ccel.org/ccel/schaff/npnf214.xi.ii.html

The Ecole Glossary: Leo the Great
- Biographical profile, by Karen Rae Keck.
- http://www2.evansville.edu/ecoleweb/glossary/leo.html

Pope St Leo--Pray to God for us!
- Focuses on his relevance for Christian unity. Includes article examining his role in Catholic and Orthodox Churches.
- http://www.catholic-forum.com/members/popestleo/index.html

Leo the Great, Pope, Doctor of the Church
- From the book "Lives of Saints," published by John J. Crawley.
- http://www.ewtn.com/library/MARY/LEO.htm

St. Leo I, the Great
- Account of his pontificate.
- http://www.cfpeople.org/Books/Pope/POPEp45.htm

Leo the Great, Bishop of Rome, Doctor
- Profile. Includes prayer in traditional and contemporary language.
- http://elvis.rowan.edu/~kilroy/JEK/11/10.html

Aeterna Dei Sapientia: On Saint Leo the Great
- Encyclical of Pope John XXIII promulgated on 11 November 1961.
- http://www.catholic-forum.com/saints/stl04001.htm

Pope St. Leo I (the Great)
- Article on his pontificate, second in Christian antiquity only to that of Gregory the Great in importance. Leo died in 461.
- http://www.newadvent.org/cathen/09154b.htm

Leo I, Saint, Pope
- Short profile from the Columbia Encyclopedia.
- http://www.bartleby.com/65/le/LeoI-St.html

St. Leo the Great
- The story of this pope. Suitable for children.
- http://www.tntt.org/vni/tlieu/saints/St1110.htm

Leo I (the Great), 461
- Biography.
- http://www.cin.org/leogreat.html

Patron Saints Index: Leo the Great
- Illustrated profile.
- http://www.catholic-forum.com/saints/saintl04.htm