Duchess Amalie Louise of Courland (23 July 1687 – 18 January 1750), German: Amalia Luise Herzogin von Kurland, official titles: Herzogin in Livland, zu Kurland und Semgallen, Fürstin zu Pilten, was a duchess from the House of Kettler and through marriage Fürstin of Nassau-Siegen.

[4] Amalie Louise married at the Old Castle [de] in Bayreuth[5][6] on 13 April 1708[2][note 2][5][6] to her first cousin Fürst Frederick William Adolf of Nassau-Siegen[note 3] (Nassauischer Hof [de], Siegen,[8] 20 February 1680[9] – Nassauischer Hof, Siegen,[8] 13 February 1722[10]), the eldest son of Fürst William Maurice of Nassau-Siegen and Princess Ernestine Charlotte of Nassau-Schaumburg.

Thus, there were no male heirs and the Dowager Fürstin was compelled to accept that the Catholic Fürst William Hyacinth would take possession of the Reformed lands and the city of Siegen.

In order to drive out this occupation by Nassau-Dillenburg and Nassau-Diez, Elector Clemens August of Cologne called in the Landesausschuß in his countries bordering the Siegerland.

[16] During the visits to his German lands in 1741 and 1742, Prince William IV of Orange-Nassau stayed with Amalie Louise and her daughter-in-law Sophie Polyxena Concordia in the Nassauischer Hof in Siegen.