Count Palatine Gustav Samuel Leopold of the House of Wittelsbach was the Count Palatine of Kleeburg from 1701 until 1731 and the Duke of Zweibrücken from 1718 until 1731. His titles included: 5th Duke of Stegeborg, Count Palatine of the Rhine, and Duke in Bavaria.

The Duchy of Palatinate-Zweibrücken was a duchy of the Holy Roman Empire with full voting rights to the Reichstag. Its capital was Zweibrücken. The reigning house, a branch of the Wittelsbach dynasty, was also the Royal House of Sweden from 1654 to 1720.