The Operational Zone of the Adriatic Littoral (, OZAK; or colloquially: "Operationszone Adria"; ; ; ) was a Nazi German district on the northern Adriatic coast created during World War II in 1943. It was formed out of territories that were previously under Fascist Italian control until its takeover by Germany. It included parts of present-day Italian, Slovenian, and Croatian territories. The area was administered as territory attached, but not incorporated to, the "Reichsgau" of Carinthia. The capital of the zone was the city of Trieste.