Religious Studies Web Guide

• Biografisch Lexicon voor de geschiedenis van het Nederlandse Protestantisme - biographical dictionary of the history of Dutch Protestantism includes over 2,000 indifiduals.
• Biographical Dictionary of Chinese Christianity - "essential biographical facts of Chinese and foreign Christian missionaries, church leaders, evangelists, and laity chiefly responsible for laying the foundations and advancing the growth of Chinese Christian communities and their influence in societies around the world. While the database is widely inclusive of time periods and faith traditions, the distinctive focus of the project is on the lesser-known Chinese Christians of the modern era (1800 to 1950)."0
• Dictionary of African Christian Biography
• Key Figures from Musée Protestant
• Reallexikon zur deutschen Kunstgeschichte - good for Christian art
• New Schaff-Herzog Encyclopedia of Religious Knowledge by Philip Schaff - 13 vols. ( from Christian Classics Ethereal Library) - excellent for biographical information
• Surman Index -  brief biographical information on Congregational Ministers

• Dictionary of Greek and Roman Antiquities (Smith, Wayte, Marindin 1890)
• Dictionary of Christian Biography and Literature to the end of the 6th century edited by Henry Wace and William Piercy (1911) - also available through Christian Classic Etheral Library and Internet Archive
• LBG (Lexicon zur byzantinischen Gräzität) - "The LBG is the foremost lexicographical resource in Byzantine Studies mainly covering the period from the 4th to the 15th century A.D. taken from more than 3,000 texts. Seven fascicles have appeared to date, with one more scheduled to appear in 2016. When completed the dictionary will consist of more than 2,000 printed pages, containing approx. 80,000 lemmata."
• Monastery Database (from Germania Sacra)  - "it provides basic regional information on all monasteries and monasteries in the area of ​​the Old Kingdom from the time of the foundation of monastic communities to the Reformation or secularization."

• GAMEO: Global Anabaptist Mennonite Encyclopedia Online - very good source of information, includes articles copied or adapted from The Mennonite Encyclopedia

• Clergy of the Church of England Database - biographical resource for clergy from  England and Wales from the Reformation to mid-nineteenth century

The Baptist Encyclopaedia (1881)

• Brethren Encyclopedia

• All about Mary: An encyclopedic tool for information on Mary, the Mother of Christ
• Catholic Dictionary - from Catholic Culture.org this includes over 5,000 terms
• The Catholic Encyclopedia - work in progress transcribing articles from the Old Catholic Encyclopedia
• CatholicSaints.Info 
• Claremont Coptic Encyclopedia
• Crum's Coptic Dictionary
• Encyclopedia Coptica
• Franciscan Women : Encyclopedia  from Franciscan Women: History and Culture: A geographical and bio-bibliographical Internet Guide
• Iconography Terms - compiled by Nicholas Roumas and Nick Beinor and edited by Raoul Smith
• Lexikon der christlichen Moral - by Karl Hormann
• Lives of the Saints by Butler
• Marienlexicon
• Okumenisches Heiligenlexikon - lexicon of Catholic saints - can search by attributes
• A Russian-English Lexicon of Eastern Orthodox Saints" - compiled by Nicholas Roumas

• Encyclopedia of Mormonism

• Christian Cyclopedia - ed. by Erwin Lueker and produced by the Lutheran Church Missouri Synod. Focus on biographical information

• Encyclopedia of World Methodism
• Index of Methodist Ministers - lists brief information for over 1300 individuals (University of Manchester Library)

• Dictionary of Unitarian and Universalist Biography

• Gorgias Encyclopedic Dictionary of the Syriac Heritage
• Qadische: Guide to the Syriac Saints
• Syriac Dictionary (The Syriac Institute)
• The Syriac Biographical Dictionary