Matthias Gallas, Graf von Campo und Herzog von Lucera (Count of Campo, Duke of Lucera) (Matteo Gallasso; 1584 in Trento – 1647 in Vienna), was an Austrian soldier, who first saw service in Flanders, then in Savoy with the Spaniards, and subsequently joined the forces of the Catholic League as captain during the Thirty Years' War.
On the general outbreak of hostilities in Germany, Gallas, as colonel of an infantry regiment, distinguished himself, especially at the battle of Stadtlohn (1623). In 1630 he was serving as General-Feldwachtmeister under Count Collalto in Italy, and was mainly instrumental in the capture of Mantua in the War of Mantuan Succession. Made count of the Empire for this service, he returned to Germany for the campaign against Gustavus Adolphus. In command of a corps of Wallenstein's army, he covered Bohemia against the Swedes in 1631-1632, and served at the Alte Veste near Nuremberg, and at Lützen. Further good service against Bernhard of Saxe-Weimar commended General Gallas to the notice of the emperor, who made him lieutenant-general in his own army.
Upon being approached by Joachim Friedrich von Blumenthal at the Emperor Ferdinand's behest, he became one of the chief conspirators against Wallenstein, and after the tragedy of Eger was appointed to the command of the army which Wallenstein had formed and led. At the great battle of Nördlingen (August 23, 1634) in which the army of Sweden was almost annihilated, Gallas commanded the victorious Imperial forces. His next command was in Lorraine, but even the Moselle valley had suffered so much from the ravages of war that his army perished of want.