The Province of Zara (Italian: Provincia di Zara) was a province of the Kingdom of Italy, officially from 1918 to 1947. It was enlarged and made part of the Italian Governorate of Dalmatia, during World War II.
In 1915 Italy entered World War I under the provisions set in the Treaty of London. In exchange for its participation with the Triple Entente and in the event of victory, Italy was to obtain territory in northern Dalmatia, including Zara, Sebenico and most of the Dalmatian islands. At the end of the war, Italian military forces invaded Dalmatia and seized control of Zara, with Admiral Enrico Millo being proclaimed the "Governor of Dalmatia". Famous Italian nationalist Gabriele d'Annunzio supported the seizure of Dalmatia, and proceeded to Zara in an Italian warship in December 1918.
During 1918, political life in Zara intensified. The collapse of the Austro-Hungarian Monarchy led to the renewal of national conflicts in the city. With the arrival of an Italian army in the city on 4 November 1918, the Italian faction (that was the huge majority in the city) gradually assumed control, a process which was completed on 5 December when it took over the governorship. With the Treaty of Versailles (10 January 1920) Italian claims on Dalmatia contained in the Treaty of London were nullified, but later on the agreements between the Kingdom of Italy and the Kingdom of Serbs, Croats and Slovenes set in the Treaty of Rapallo (12 November 1920) gave Zara with other small local territories to Italy. The Zara enclave, a total of 104 square kilometres (40 square miles), included the city of Zara, the municipalities of Boccagnazzo/Bokanjac, Borgo Erizzo/Arbanasi, Cerno, part of Dicolo/Diklo (a total of 51 km2. of territory and 17,065 inhabitants) and the islands of Lagosta and Pelagosa (53 square kilometres (20 square miles), 1,710 inhabitants). The territory was organized into a small Italian province.