The counts of Falkenstein (from 1125 referred to as counts of Falkenstein-Neuburg) were a medieval noble dynasty from Bavaria. The family flourished under the rule of the Hohenstaufen emperors.
The counts of Falkenstein had their oldest possessions in the upper Vils valley near Taufkirchen and the valley of the Inn river (in the present-day Rosenheim district of Upper Bavaria). At the heights of their powers they controlled a wide region extending into Tyrol, in the Mangfall valley, as well as in the Chiemgau region and modern Lower Austria.
According to the Codex Falkensteinensis urbarium compiled in 1166, major domiciles of the Falkenstein counts were the ancestral seat of Falkenstein über dem Inn (near Flintsbach) as well as the castles of Neuburg (near Vagen), Hartmannsberg in Chiemgau (near Bad Endorf), and Hernstein in Lower Austria. Later acquisitions included Altenburg (in present-day Feldkirchen-Westerham), Herantstein in Upper Austria, and Antwurt (now Antwort) near Bad Endorf. The counts acted as Vogt officials and judges; administrative seats were e.g. Aibling and Prien.
The original allodial possessions of the Falkensteins were located around the village of Geiselbach (today part of Taufkirchen) in the upper Vils valley. The first count mentioned in records was one Reginolt de Valchensteine in 1115, although both the Falkenstein and Neuburg lineage seem to descend from one Patto of Dilching who lived in the early 11th century. According to tradition, the Falkenstein estates in the Inn valley comprised vast lands that had been abandoned during the Hungarian invasions in the 10th century.