The Istrian–Dalmatian exodus was the post-World War II exodus and departure of local ethnic Italians as well as ethnic Slovenes and Croats from Yugoslavia. The emigrants, who had lived in the now Yugoslav territories of the Julian March, Kvarner and Dalmatia, largely went to Italy, but some joined the Italian diaspora in the Americas, Australia and South Africa. These regions were ethnically mixed, with long-established historic Croatian, Italian, and Slovene communities. After World War I, the Kingdom of Italy annexed Istria, Kvarner, the Julian March and parts of Dalmatia including the city of Zadar. At the end of World War II, under the Allies' Treaty of Peace with Italy, the former Italian territories in Istria, Kvarner, the Julian March and Dalmatia were assigned to now Communist-helmed Federal Yugoslavia, except for the Province of Trieste. The former territories absorbed into Yugoslavia are part of present-day Croatia and Slovenia.

Istrian Italians are an ethnic group from the Adriatic region of Istria in modern northwestern Croatia and southwestern Slovenia. Istrian Italians descend from the original Latinized population of Roman Histria, from the Venetian-speaking settlers who colonized the region during the time of the Republic of Venice, and from the local Croatian people who culturally assimilated.