Charlotte Christine Buissine or Buissinne (4 April 1749 – after 1781) was a Frenchwoman who was the first mistress of William I, Elector of Hesse from 1775 until 1778.
She was the daughter of a Hanau civil servant, the farmer Henri Buissine, and his wife Charlotte Varlut, both of French descent.
[1] Prince William was then and until 1786 regent in the County of Hanau, then a secundogeniture of the Landgraviate of Hesse-Kassel.
Issue: With William I, Elector of Hesse, Charlotte had four children, three of whom lived to adulthood: The illegitimate children of Charlotte and William received - like their mother - the titles Freiherr/Freifrau/Freiin von Heimrod, the place of birth of the firstborn child.
She was replaced by Rosa Dorothea Ritter as William's second official mistress.