The Julian March, also called Julian Venetia, is an area of southern Central Europe which is currently divided among Croatia, Italy, and Slovenia. The term was coined in 1863 by the Italian linguist Graziadio Isaia Ascoli, a native of the area, to demonstrate that the Austrian Littoral, Veneto, Friuli, and Trentino shared a common Italian linguistic identity. Ascoli emphasized the Augustan partition of Roman Italy at the beginning of the Empire, when Venetia et Histria was Regio X.

Venetian, wider Venetian or Venetan is a Romance language spoken natively in the northeast of Italy, mostly in Veneto, where most of the five million inhabitants can understand it. It is sometimes spoken and often well understood outside Veneto: in Trentino, Friuli, the Julian March, Istria, and some towns of Slovenia, Dalmatia (Croatia) and Bay of Kotor (Montenegro) by a surviving autochthonous Venetian population, and in Argentina, Australia, Brazil, Canada, Mexico, the United States and the United Kingdom by Venetians in the diaspora.