Hochosterwitz Castle is a castle in Austria, considered one of Austria's most impressive medieval castles. It is on a 172-metre (564 ft) high dolomite rock near Sankt Georgen am Längsee, east of the town of Sankt Veit an der Glan in Carinthia. The rock castle is one of the state's landmarks and a major tourist attraction.

Margaret, nicknamed Maultasch, was the last Countess of Tyrol from the House of Gorizia (Meinhardiner), and an unsuccessful claimant to the Duchy of Carinthia. Upon her death, Tyrol became united with the Austrian hereditary lands of the Habsburg dynasty.