Dennis Edwin Showalter (February 12, 1942 – December 30, 2019) was a professor emeritus of history at Colorado College.^[3] Showalter specialized in German military history. He was president of the American Society for Military History from 1997 to 2001.^[4] In addition, Showalter was an advising fellow of the Barsanti Military History Center at the University of North Texas.^[5]

Showalter began teaching at Colorado College in 1969.^[3] Showalter also previously taught at the United States Air Force Academy, the United States Military Academy, and the Marine Corps University.^[6] He wrote extensively on the wars of Frederick the Great, the German Wars of Unification, World War I, and World War II.

• 1992 Paul Birdsall Prize for best new book given by the American Historical Association, for Tannenberg^[6]
• 2005 Samuel Eliot Morison Prize for lifetime achievement given by the Society for Military History^[7]
• 2018 Pritzker Literature Award^[8][9]

• "Manifestation of Reform: The Rearmament of the Prussian Infantry, 1806–13", The Journal of Modern History, Vol. 44, No. 3, September 1972
• Railroads and Rifles: Soldiers, Technology, and the Unification of Germany. Hamden, Connecticut: Archon/Shoe String, 1975. ISBN 0-208-01505-1
• Tannenberg: Clash of Empires, 1914. Hamden, Connecticut: Archon, 1991. ISBN 978-0-208-02252-3. Repr. Washington: Brassey's, 2004. ISBN 978-1-57488-781-5
• The Wars of Frederick the Great. London/New York: Longman, 1996. ISBN 978-0-582-06260-3
• The Wars of German Unification. London: Arnold, 2004. ISBN 978-0-340-73210-6
• Hindenburg: Icon of German Militarism. Military Profiles. Washington: Potomac, 2005. ISBN 978-1-57488-653-5 (with William J. Astore)
• Patton and Rommel: Men of War in the Twentieth Century. New York: Berkley Caliber, 2005. ISBN 978-0-425-19346-4
• Armor and Blood: The Battle of Kursk: The Turning Point of World War II. Random House, 2013. ISBN 978-1400066773