Iz is an island in the Zadar archipelago, between the island of Dugi Otok and the island of Ugljan, separated from them by the Srednji channel in the east and the Iski channel in the west. It is surrounded by ten islets, the biggest among them being Knezak. The islet of Rutnjak in front of the harbour is arranged as a park. The highest peak of Iz is Korinjak (168 m). Major places are Mali Iz (Small Iz) and Veli Iz (Big Iz).

The island was populated as early as the prehistoric times. Constantine Porphyrogenitus called it Ez in the 10th century; in the Middle Ages and later it belonged to the aristocracy and citizens of Zadar. - The parish church of St. Peter in Veli Iz was first mentioned in the 14th century; however, it has not been preserved in its original form. The castle of the Canagietti family from Zadar has been preserved; the castle of the Fanfogna family, originally built in the Romanesque style and later reconstructed, was converted into a school in the 19th century. Above the harbour, on top of the village Mali Iz is a pre-Romanesque church (11th c.), of a circular ground-plan with a semicircular apse; a rectangular nave was added to it in the 17th century. Close to it is a fortified castle.

The island of Iz is an ideal destination for peaceful vacations, quite remote from usual crowds of tourists. Since the traditional occupations of the local population are farming and fishing, tourists are offered excellent home-made food. Veli Iz features an interesting museum collection, comprising mainly ethnographical artefacts.