Gildas Badonicus
- A commentary by John Morris on the 6th-century author, a summary by Frank Reno of the confusions with others of the same name, the 11th-century and 12th-century lives and the Giles translation of De Excidio Brittaniae et Conquestu.
- http://camelot.celtic-twilight.com/camelot/gildas/

Gildas, Saint
- Very brief biographical entry in the Columbia Encyclopedia.
- http://www.bartleby.com/65/gi/Gildas-S.html

Gildas the Wise
- Biographical profile, by Karen Rae Keck.
- http://www2.evansville.edu/ecoleweb/glossary/gildas.html

St. Gildas Badonicus
- Biography by David Nash Ford of the 6th-century author of "De Excidio Britanniae," drawing on the dubious 11th-century life by a monk of Rhuys.
- http://www.earlybritishkingdoms.com/bios/gildas.html

Vietnamese Eucharistic Youth Society: St. Gildas
- The story of St. Gildas the Wise, suited to children. Preformatted line breaks can make this difficult to read.
- http://www.tntt.org/vni/tlieu/saints/St0129.htm

St. Gildas the Wise, or Badonicus, Abbot
- From Alban Butler's Lives of the Saints.
- http://www.cin.org/saints/gildas.html

Gildas
- Profile of the saint. With links.
- http://www.catholic-forum.com/saints/saintg31.htm

Catholic Encyclopedia: St. Gildas
- Biographical entry for St. Gildas the Wise, also called "Badonicus," born to a British family in Scotland, educated in Wales, monk, priest, died in 570.
- http://www.newadvent.org/cathen/06557c.htm