Wilhelmine Dorothee von der Marwitz (April 1718 – 16 January 1787) was the mistress of Frederick, Margrave of Brandenburg-Bayreuth from the late 1730s until 1744.
After her mother's death, she and her sisters were raised by their maternal aunt, Flora von Sonsfeld, the Hofmeisterin of Princess Wilhelmine of Prussia.
The Princess married the Margrave of Brandenburg-Bayreuth in 1731, and her aunt wanted to bring fourteen-year-old Wilhelmine Dorothee to Bayreuth to finish her education.
However, the three girls were heiresses to their father's fortune, and King Frederick William I had forbidden such women to leave the country, confiscating their wealth if they did so.
In 1744, her employer, the Margravine, arranged for her to marry an Austrian count, Otto Ludwig Conrad von Burghauß (1713–1795).