Theodore Stephen Hamerow (August 24, 1920 – February 16, 2013) was a Polish-born American historian, focusing on modern history, especially German history of the 19th and 20th century.^[1][2]

Born to Jewish parents in Warsaw, Hamerow moved via France to the United States with his family in 1930.^[3] He earned his bachelor's degree from City College of New York in 1942, followed by a master's from Columbia University in 1947. In 1951, he earned his doctorate under supervision of Hajo Holborn at Yale University.^[3][4]

Hamerow was a professor of German history at the University of Illinois at Urbana–Champaign from 1952 to 1958, before joining faculty at the University of Wisconsin–Madison, where he taught until 1991.^[3]

Hamerow died in Madison, Wisconsin, in 2013.^[3][4]

• Restoration, Revolution, Reaction: Economics and Politics in Germany, 1815–1871 (1958)
• Social Foundations of German Unification, 1858–1871, 2 vols. (1969–72)
• (ed.), The Age of Bismarck: Documents and Interpretations (Harper/Evanston, New York, NY/London 1972)
• Reflections on History and Historians (1987)
• On the Road to Wolf's Lair: German Resistance to Hitler (1997)
• Why We Watched: Europe, America, and the Holocaust (2008)

• Theodore S. Hamerow, Remembering a Vanished World. A Jewish Childhood in Interwar Poland (2001)
• Andreas Daum, "Refugees from Nazi Germany as Historians: Origins and Migrations, Interests and Identities", in The Second Generation: Émigrés from Nazi Germany as Historians. With a Biobibliographic Guide, ed. Daum, Hartmut Lehmann, James J. Sheehan. New York: Berghahn Books, 2016, ISBN 978-1-78238-985-9, 1‒52.