- Catholic Encyclopedia: The Thirty Years War
- Discussing causes of the war, the Bohemian Revolt, the Palatinate, Denmark, the widening of the war, and its consequences. - Crown & The Cross - The Thirty Years' War in Germany
- Offers students information on the war, especially in relation to Germany and the Hapsburg Lands. - Excerpts of Sources on the Thirty Years' War
- Excerpts from primary sources, from Readings in European History. - Gustavus Adolphus (1594-1632)@
- infoplease.com: Thirty Years War
- About the European war fought mainly in Germany, between 1618-1648. - Museum of the Thirty Years' War
- Includes sections on myths and truths, causes, battles, and the peace. - Queen Christina of Sweden (1626-1689)@
- Richelieu, Armand-Jean du Plessis, Duc and Cardinal de (1585-1642)@
- Schiller's History of the Thirty Years' War@
- The Thirty Years War
 - Summary of the military conflicts as well as detailed narratives from the Bohemian Rebellion in 1618 through the Peace of Westfalia in 1648. - Thirty Years War 1618-1648 & 1733-1763
- Distinguishing between the religious war of the 17th Century and a series of conflicts in the 18th Century. - Thirty Years War, The
 - Considers such topics as causes, effects, weapons, and famous battles. - Thirty-Years-War Lecture
- From Professor Gerhard Rempel, of Western New England College. - Treaty of Westphalia (1)
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