General
Cambridge Histories Online offers access to all 61 titles of the Cambridge Histories series.
Cambridge historical dictionary of disease
International encyclopedia of revolution and protest : 1500 to the present
Oxford Companion to Military History
Chronological
Ancient
Encyclopedia of ancient history
Oxford encyclopedia of ancient Egypt
Classical
Brill's New Pauly : encyclopaedia of the ancient world : Antiquity
Oxford companion to classical civilization
Oxford Classical Dictionary, 4th Edition covers history, literature, myth, religion, linguistics, philosophy, law, science, art and archaeology, and topics including Near Eastern studies and late antiquity.
Oxford Dictionary of the Classical World
Oxford encyclopedia of ancient Greece and Rome
Medieval
All things medieval : an encyclopedia of the medieval world
Lexikon des Mittelalters (Choose EN on top bar for English)
Oxford dictionary of the Middle Ages
Cambridge Companion to Medieval English Culture
Grove encyclopedia of medieval art and architecture
Oxford dictionary of Byzantium
Oxford encyclopedia of medieval warfare and military technology
Early Modern
Brill's Encyclopaedia of the Neo-Latin World
Brill's New Pauly : encyclopaedia of the ancient world : Classical tradition covers the post-classical life of the classical heritage and the history of classical studies up to the present.
Encyclopedia of early modern history online
Oxford dictionary of the Renaissance
Oxford Encyclopedia of the Reformation
Modern
Encyclopedia of the Enlightenment
20th Century
Dictionary of contemporary world history : from 1900 to the present day
Geographical
Britain/Ireland
Oxford Companion to Black British History
Oxford Companion to Family and Local History
Oxford Companion to Irish History
Oxford Companion to Scottish History
Oxford Companion to the Romantic Age
Oxford Dictionary of Local and Family History
Australia
Oxford Companion to Australian History
Oxford Companion to Australian Military History
Canada