Irenaeus
- Article in the 1911 Encyclopædia Britannica on the early theologian's life and works. Includes bibliography.
- http://www.1911encyclopedia.org/Irenaeus

Catholic Online: St. Irenaeus
- Short biography, estimates that the year of his death was 202.
- http://www.catholic.org/saints/saint.php?saint_id=291

St. Irenaeus of Lyons
- Summary of his life and writings, by Theresa A. Winters.
- http://www2.evansville.edu/ecoleweb/glossary/irenaeus.html

Irenaeus, Saint
- Brief entry in the Columbia Encyclopedia.
- http://www.bartleby.com/65/ir/Irenaeus.html

Saint Irenaeus, Doctor of the Church
- From the book "Lives of Saints," published by John J. Crawley.
- http://www.ewtn.com/library/MARY/IRENAEUS.htm

Catholic Encyclopedia: St. Irenaeus
- Article on the bishop of Lyons, Father of the Church, d. late second or early third century.
- http://www.newadvent.org/cathen/08130b.htm

Irenaeus, Bishop of Lyons, Theologian
- An essay on his teaching. With prayer in traditional and contemporary language.
- http://elvis.rowan.edu/~kilroy/JEK/06/28.html

Vietnamese Eucharistic Youth Society: St. Irenaeus
- The story of this early bishop of Lyons. Suitable for older children.
- http://www.tntt.org/vni/tlieu/saints/St0628.htm

Irenaeus of Lyons
- Profile.
- http://www.catholic-forum.com/saints/sainti06.htm