In most cases, library login is required.

Bible

• All Things in the Bible: An Encyclopedia of the Biblical World
• Anchor Yale Bible Dictionary 
• Baker Compact Dictionary of Biblical Studies
• Baker's Evangelical Dictionary of Biblical Theology (No login required; scroll down the page to the A-Z list of articles
• Cambridge Companion to the Bible
• Cultural Handbook to the Bible
• Dictionary of Bible Plants
• Dictionary of Nature Imagery of the Bible
• Dictionary of the Bible (Hastings, 1916)
• Dictionary of the Bible (Oxford)
• Dictionary of the English Bible and its Origins
• Eerdmans Dictionary of the Bible
• Encyclopedia of the Bible and its Reception
• Handbook of Biblical Social Values
• Holman Bible Dictionary (no login required)
• Oxford Bible Atlas
• Oxford Companion to the Bible
• Oxford Guide to People and Places of the Bible

           Biblical Interpretation / Criticism

• Cambridge Companion to Biblical Interpretation
• Concise Dictionary of Bible Origins and Interpretation
• Dictionary of Biblical Criticism and Interpretation
• Handbook of Biblical Criticism
• Handbook of Biblical Reception in Jewish, European Christian, and Islamic Folklores
• Handbook of Patristic Exegesis
• Oxford Handbook of Biblical Studies

Old Testament

• A-Z of Ancient Israel
• Dictionary of the Old Testament Historical Books
• Dictionary of the Old Testament Pentateuch
• Dictionary of the Old Testament: Prophets
• Dictionary of the Old Testament: Wisdom, Poetry & Writings
• Oxford Handbook of the Septuagint

New Testament

• Cambridge Companion to the New Testament
• Dictionary of the Later New Testament & its Developments 
• Handbook on the Jewish Roots of the Christian Faith
• IVP Bible Background Commentary: New Testament
• Who's Who in the New Testament

Jesus and the Gospels

• Cambridge Companion to Jesus
• Cambridge Companion to the Gospels
• Cambridge Companion to the Gospels, 2nd ed.
• Dictionary of Jesus and the Gospels, 2nd ed.
• Handbook for the Study of the Historical Jesus (4 vols.)
• Historical Dictionary of Jesus
  
  Paul
• Cambridge Companion to St. Paul
• Cambridge Companion to St. Paul (New Cambridge)
• Dictionary of Paul and his Letters
• Paul and Economics: A Handbook
• Paul in the Greco-Roman World, v.1, v.2

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Commentaries (see also e-commentaries tabs in this guide)

• International Critical Commentary series (older volumes, pre-1923)
• IVP New Testament Commentary Series (No login required).
• Oxford Bible Commentary

• Dictionary of Qumran Aramaic
• Encyclopedia of the Dead Sea Scrolls (Oxford)         
• T&T Clark Companion to the Dead Sea Scrolls

General Church History

• Atlas of Christian History (2017)
• Biographical Dictionary of Chinese Christians 
• Cambridge Dictionary of Christianity
• Canadian Christian Leaders [a new, developing resource]
• Concise Oxford Dictionary of the Christian Church
• Dictionary of African Christian Biography
• Dictionary of Popes
• Encyclopedia of Christian Literature (2 vols.)
• Oxford Dictionary of Saints
• Oxford Dictionary of the Christian Church, 4th ed.
• Who's Who in Christianity

Ancient Christianity

• Brill Dictionary of Gregory of Nyssa
• Companion to Second-Century Christian "Heretics"
• Encyclopedia of Ancient Christianity (3 vols.)
• Encyclopedia of Early Christianity
• Oxford Dictionary of Byzantium (3 vols.)

Middle Ages

• A-Z of the Crusades
• Encyclopedia of the Middle Ages (Oxford)

Reformation

• Historical Dictionary of Radical Christianity
• Historical Dictionary of the Reformation and Counter-Reformation
• Oxford Encyclopedia of the Reformation (4 vols.)
• Renaissance and Reformation: 1500-1620: A Biographical Dictionary

General/Global

• Encyclopedia of Millennialism and Millennial Movements
• Encyclopedia of Protestantism
• Essential Handbook of Denominations and Ministries (2017)
• Handbook of Global Contemporary Christianity

Anabaptism

• Companion to Anabaptism and Spiritualism, 1521-1700

Anglicanism

• Historical Dictionary of Anglicanism

Catholicism

• Encyclopedia of Catholicism

Evanglicalism

• Encyclopedia of Evangelicalism
• Evangelical America: An Encyclopedia of Contemporary American Religious Culture

Holiness

• Historical Dictionary of the Holiness Movement

Lutheranism

• Dictionary of Luther and the Lutheran Traditions

Mennonites

• Global Anabaptist Mennonite Encyclopedia
• Pennsylvania Germans: An Interpretive Encyclopedia

Methodism

• Dictionary of Methodism in Britain and Ireland
• Encyclopedia of World Methodism (1974)
• T & T Clark Companion to Methodism

Pentecostalism

• Dictionary of Pan-African Pentecostalism: v.1, North America

Puritanism

• Historical Dictionary of the Puritans

Reformed Church

• Historical Dictionary of the Reformed Churches
• Pocket Dictionary of the Reformed Tradition

• Handbook of Religion and the Authority of Science
• New Dictionary of Christian Apologetics

Ethics

• Westminster Dictionary of Christian Ethics

Ministry

• Handbook of Christian Ministry
• Handbook of Megachurches
• Preacher's Bible Handbook

Mission

• Encyclopedia of Missions (PDF download, 1904: presents a very good snapshot of the state of missions at that time; not a resource for current missions studies)
• Worship and Mission for the Global Church: An Ethnodoxology Handbook

Philosophy, Christian

• Christian Philosophy A-Z
• Christian Worldview Handbook

Sociology of Religion

• Handbook of the Sociology of Religion

Spirituality

• APA Handbook: Psychology, Religion and Spirituality   |   vol. 1   |    vol. 2
• Encyclopedia of Religious and Spiritual Development
• Pocket Dictionary of Christian Spirituality

Worship

• Encyclopedia of American Gospel Music
• Worship and Mission for the Global Church: An Ethnodoxology Handbook

Jainism

• Historical Dictionary of Jainism

Judaism

• 20th Century Jewish Religious Thought
• Cambridge Dictionary of Judaism & Jewish Culture
• Dictionary of Jewish-Christian Relations
• Dictionary of Jewish Terms
• Dictionary of Jewish Words
• Historical Dictionary of Prophets in Islam and Judaism
• Jewish Encyclopedia  (1901-1906)
• JPS Guide to Jewish Traditions
• Oxford Concise Companion to the Jewish Religion
• Routledge Dictionary of Judaism

Shinto

• Historical Dictionary of Shinto

Sikh Religion

• Historical Dictionary of Sikhism
• Sikh Encyclopedia

New Religious Movements

New Religious Movements (General)

• Cambridge Companion to New Religious Movements
• Encyclopedia of New Religious Movements
• Handbook of Hyper-real Religions
• Handbook of Nordic New Religions
• Historical Dictionary of New Religious Movements

Jehovah's Witnesses

• A-Z of Jehovah's Witnesses
• Historical Dictionary of Jehovah's Witnesses

Unitarian Universalism

• A-Z of Unitarian Universalism
• Historical Dictionary of Unitarian Universalism

Other

Cambridge Companions provide multi-author, multi-chapter introductions to key topics.