Hans Delbrück (November 11, 1848 - July 14, 1929), German historian, was born at Bergen on the island of Rügen, and studied at the universities of Heidelberg and Bonn.

As a soldier he fought in the Franco-German War, after which he was for some years tutor to one of the princes of the German imperial family. In 1885 he became professor of modern history in the university of Berlin, and he was a member of the German Reichstag from 1884 to 1890.

Delbrück's writings are chiefly concerned with the history of the art of war, his most ambitious work being his Geschichte der Kriegskunst im Rahmen der politischen Geschichte (first section, Das Altertum, 1900; second, Römer und Germanen, 1902; third, Das Mittelalter, 1907). Among his other works are:

• Die Perserkriege und die Burgunderkriege (Berlin, 1887)
• Historische und politische Aufsätze (1886)
• Erinnerungen, Aufsätze und Reden (1902)
• Die Strategie des Perikles erläutert durch die Strategie Friedrichs des Grossen (1890)
• Die Polenfrage (1894)
• Das Leben des Feldmarschalls Grafen Neithardt von Gneisenau (1882 and 1894).

Delbrück began in 1883 to edit the Preussische Jahrbucher, in which he wrote many articles, including one on General Wolseley über Napoleon, Wellington und Gneisenau, and he has contributed to the Europäischer Geschichtskalender of H Schulthess.