Falkenstein is a town in the district of Mistelbach, in the Austrian state of Lower Austria. It lies in the country's northeast, within the Weinviertel region near the Czech border.
The settlement is a small market town whose history is reflected in its historic centre and in the ruins of Falkenstein Castle, which stand on a hill above the town. The surrounding landscape is rural, characterised by farmland, vineyards and low hills.
Falkenstein is among the many small communities that make up the Mistelbach district, and it remains primarily a residential and agricultural locality rather than a major tourist destination.