The Second Battle of the Isonzo was fought between the armies of the Kingdom of Italy and those of Austria-Hungary in the Italian Front in World War I, between 18 July and 3 August 1915.

The Italian front was one of the main theatres of war of World War I. It involved a series of military engagements in Northern Italy between the Central Powers and the Entente powers from 1915 to 1918. Following secret promises made by the Allies in the 1915 Treaty of London, the Kingdom of Italy entered the war on the Allied side, aiming to annex the Austrian Littoral, northern Dalmatia and the territories of present-day Trentino and South Tyrol.