The March of Carinthia is a frontier district (march) of the Carolingian Empire created in 889.

Before it wis a march, it is a principality or duchy ruled by native-born Slavic (or semi-Slavic) princes at first independently and then under Bavarian and subsequently Frankish suzerainty.

The realm is divided into counties which, after the succession of the Carinthian duke to the East Frankish throne, are united in the hands of a single authority as a march of defense against the Slavs of Pannonian Croatia.

When the march of Carinthia is raised into a Duchy in 976, a new Carinthian march (that is, a march defending the Carinthian duchy) was created.

It becomes the later March of Styria.