Burgruine Hohenburg auf Rosenberg is a ruined medieval castle near Spittal an der Drau in Carinthia, Austria.

It is located high above the Drava Valley on the southern slope of the Ankogel Group, part of the Hohe Tauern mountain range.

It was then the seat of a Bavarian noble family, who as Counts of Lurn administered the Lurngau (see: Lurnfeld) region within the Duchy of Carinthia.

The last count, Altmann, had become Prince-Bishop of Trent in 1124, and upon his death in 1149, the castle was bequested to the Archbishopric of Salzburg and became the seat of episcopal ministeriales.

In 1311, Archbishop Conrad IV of Salzburg enfeoffed a part of Hohenburg Castle to the sons of late Count Frederick I of Ortenburg (1247–1304).