See also Classics and Writings for more detail on early documents.
General
Early Sources of Christianity
The Ecole Initiative: Early Church History of the Web
Early Church Fathers
Christian Origins The Internet Ancient History Sourcebook
Index of Church Fathers
Internet Resources for Biblical Studies
Noncanonical Homepage, including: OT Apocrypha, OT Pseudepigrapha, Apocryphal NT Acts, Apocryphal NT, Apocalypse, Apocryphal NT Gospels, Fathers of the Church, Writings in the names of Biblical Characters
Non-Canonical Documents (Wesley Center for Applied Theology),
Early Church Documents (A big collection from the ECOLE Initiative)
Writings of the Church Fathers/Doctors/Saints (American University),
Christian Classics Ethereal Library
The Early Church Fathers (a 38-volume collection of writings),
Jerome: Letters and Select Works
Gnostic scriptures and fragments in translation (The Virtual Library)
The Thunder: Perfect Mind, translated by Anne McGuire
Guide to Early Church Documents
Fathers of the Church (lots of texts from the New Advent site)
Check out Woman from The Catholic Encyclopedia
The Gregory of Nyssa Page
The Gospel of Thomas Page
Church Fathers
The Twelve Apostles
- The Didache
Clement of Rome
- First Clement -- c.96
- Second Clement -- c.150
Barnabas
- The Epistle of Barnabas -- c.130
Papias
- Fragments of Papias
Mathetes
- The Epistle of Mathetes to Diognetus
Hermas
- The Shepherd of Hermas -- c.150
Polycarp
- The Epistle of Polycarp to the Philippians -- c.130
- The Martydom of Polycarp
Miscellaneous Writings
- The Epistle of Adrian in behalf of the Christians
- The Epistle of Antoninus
- The Epistle of Marcus Aurelius to the Senate
Ignatius -- ?-c.108
The Generally accepted Epistles of Ignatius
- The Epistle of Ignatius to the Ephesians
- The Epistle of Ignatius to the Philadelphians
- The Epistle of Ignatius to the Magnesians
- The Epistle of Ignatius to the Romans
- The Epistle of Ignatius to the Smyrnaeans
- The Epistle of Ingnatius to the Trallians
- The Epistle of Ignatius to Polycarp
Other Spurious Epistles in the name of Ignatius
- The Epistle of Ignatius to Mary at Neapolis
- The Epistle of Maria the Proselyte to Ignatius
- The Epistle of Ignatius to St. John the Apostle
- The Second Epistle of Ignatius to St. John the Apostle
- The Epistle of Ignatius to Hero, A deacon of Antioch
- The Epistle of Ignatius to the Antiochians
- The Third Epistle of Ignatius
- The Epistle of Ignatius to the Tarsians
- The Second Epistle of Ignatius to the Ephesians
- The Epistle of Ignatius to the Philippians
- Another Version of Ignatius to Polycarp
- The Epistle of Ignatius to the Virgin Mary
- The Reply of the Virgin Mary to Ignatius
Justin Martyr -- c.100-c.165
- The First Apology of Justin
- The Second Apology of Justin
- Other Fragments from the Lost Writing of Justin
- Justin's Discourse to the Greeks-1
- Justin's Hortatory Address to the Greeks
- Justin on the sole government of God
- Justin on the Resurrection
Irenaeus of Lyons -- c.130-c.200
- Against Heresies-Book 1
- Against Heresies-Book 2
- Against Heresies-Book 3
- Against Heresies-Book 4
- Against Heresies-Book 5
- Fragments of Irenaeus
- Works of the Elders Preserved by Irenaeus
Tertullian -- c.150-c.212
- Patience
- Prayer
- Spectacles
- The Apparel of Women
- To the Martyrs
Eusebius of Caesarea -- c.260-340
- Church History
Athanasius -- c.296-373
- On the Incarnation
Basil the Great -- c.330-379
- BASIL THE GREAT, Second Epistle
- BASIL THE GREAT, Seventh Epistle
- BASIL THE GREAT, Eighth Epistle
St. Jerome -- 331-420
- Letters and Selected Works
John Chrysostom -- c.350-407
- Homilies on Matthew
- Homilies on John and Hebrews
- Homilies on Acts and Romans
- Commentary and Homilies on Galatians and Ephesians
- Homilies on Philippians, Colossians, and Thessalonians
- Homilies on 1st & 2nd Timothy, Titus, and Philemon
- Various Homilies, Letters and Treatise by Chrysostom
Augustine -- 354-430
- Confessions
- Enchiridion
- Dialectica
- On Christian Doctrine
- The Letters of St. Augustine
- The Anti-Manichaean and Anti-Donatist Writings of Augustine
Theodore of Studium
- THEODORE OF STUDIUM: Selected Poems, with the Letter to Casia
- Theodore of Studium: TWENTY-SEVENTH DISCOURSE
- Theodore of Studium: SIXTY-FIRST DISCOURSE
Methodius of Olympus
- Methodius of Olympus, ORATION ON SIMEON AND ANNA
Gregory of Nazianzen
- Gregory of Nazianzen (the Theologian): SECOND PASCHAL ORATION
Anastasius the Librarian
- Anastasius the Librarian: Life of St. Peter of Alexandria