Marian Theodore Charlotte Heidenreich von Siebold (12 September 1788 – 8 July 1859) was a German physician.Ulrike Enke: Geburtshelferin der englischen Königin. In: Hessisches Ärzteblatt. 8, 2009, ISSN 0171-9661, S. 525–526, Volltext (PDF; 185 kB). She is regarded as the first gynecologist in Germany. She was the daughter of the physicians Damian and Regina von Siebold and was an early assistant of her parents. She graduated with a degree in obstetrics at the Giessen University in 1817.
