威尼斯朱利亚（意大利语：Venezia Giulia）是横跨意大利、斯洛文尼亚和克罗地亚的一个历史地区。这一地区临亚德里亚海，包括了伊斯托利亚半岛，主要城市是的里雅斯特。在战间期时，这里曾全部由意大利王国统治。现在这里由意大利、斯洛文尼亚和克罗地亚三国分治。

The Julian March (Serbo-Croatian, Slovene: Julijska krajina) or Julian Venetia (Italian:Venezia Giulia; Venetian:Venesia Julia; Friulian:Vignesie Julie; German:Julisch Venetien), is an area of southeastern Europe, today split among Croatia, Italy, and Slovenia. Julian March was coined by the Italian geographer Graziadio Isaia Ascoli in order to present the Austrian Littoral as a unified region and "historic part of Italy", placing emphasis on the Augustan partition of Roman Italy at the beginning of the Empire, when Venetia et Histria was the Regio X ("Tenth Region").