Forchtenstein (Hungarian: Fraknóváralja or Fraknókő, Croatian: Fortnavski grad; until 1972, Forchtenau, Fraknó, Fortnava) is a town in the district of Mattersburg in the Austrian state of Burgenland.

It is the location of Forchtenstein Castle, one of the many palaces of the famous Esterházy family.

It consists of two subdivisions (Katastralgemeinden) which were formerly separate towns: Forchtenau (Hungarian: Fraknó) and Neustift an der Rosalia (Hungarian: Újtelek).

The castle boasted many torture chambers including one called the Pit of Oblivion, a deep pit where torture victims would be strung upside down and deprived of food and water until they died.

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