Societies and Institutes: National
- Japanese Association for Eastern Christian Studies
- Japanese Association for Religious Studies (JARS)
Societies and Institutes: International
- Adamantius: Italian Research Group on “Origen and the Alexandrian Tradition”
- Association Internationale d’Études Patristiques/ International Association of Patristic Studies (AIEP / IAPS)
- Asia-Pacific Early Christian Studies Society (APECSS)
- Canadian Society of Patristic Studies (CSPS)
- Centre for Late Antique Religion and Culture, Cardiff University (CLARC)
- Center for the Study of Early Christianity, Catholic University of America
- Early Christianity in its Greco-Roman Context
- Institute for Antiquity and Christianity (IAC), Claremont Graduate School
- North American Patristics Society (NAPS)
- Oxford Centre for Late Antiquity (OCLA)
- Patristik und Geschichte der antiken Kirche, Universität Freiburg Schweiz
- Textes pour l’histoire de l’Antiquité tardive
Early Christian Studies
- The Ancient Christian Commentary on Scripture
- Bibliographic Information Base in Patristics (BIBP)
- Bibliotheca Augustana: Bibliotheca Latina
- Christian Classics Ethereal Library (CCEL)
- Commission for Editing the Corpus of the Latin Church Fathers (CSEL)
- Corpus Christianorum
- Corpus Scriptorum Latinorum
- Early Church Fathers – Additional Texts by Roger Pearse
- EWTN “Patristics” Document Library
- Gnostic Society Library
- Historic Documents of the Church
- Hugoye: Journal of Syriac Studies
- Internet Christian Library
- The Internet Connection for Medieval Resources
- Internet Medieval Sourcebook
- Internet Theology Resources
- Jewish Roots of Eastern Christian Mysticism
- The Latin Library: Christian Latin
- Monachos.net — Patristic Studies Area
- New Advent — Fathers of the Church
- ORB Online Encyclopedia — Late Antiquity in the Mediterranean
- Patrologia Latina
- Perseus Greek and Latin Project
- St. Pachomius Library