The Counts of Ortenburg were a comital family in the mediaeval Duchy of Carinthia. Though they had roots in Bavarian nobility, an affiliation with the Imperial Counts of Ortenburg, a branch line of the Rhenish Franconian House of Sponheim, is not established.

The House of Sponheim or Spanheim was a medieval German noble family, which originated in Rhenish Franconia. They were immediate Counts of Sponheim until 1437 and Dukes of Carinthia from 1122 until 1269. Its cadet branches ruled in the Imperial County of Ortenburg-Neuortenburg and various Sayn-Wittgenstein states until 1806.