Lukas von Graben zum Stein (until 1500 Lukas von Graben) († 1550 at Stein Castle), lord of Stein, Schwarzenegg and Weidenburg, pledger of Heinfels, was a Carinthian-Gorizian nobleman and military leader of the Counts of Gorizia and the Habsburgs. In the succession dispute over the princely County of Gorizia at the end of the 15th century, Von Graben acted as deputy of his father Virgil von Graben, administrator of Gorizia, and defender of the rights of the Habsburgs against the aspirations of the Republic of Venice.[1] In 1518 he was one of 70 representatives in the first Austrian general parliament of Emperor Maximilian I in Innsbruck.