Landgravine Elisabeth Henriëtte von Hessen-Kassel (18 November 1661 – 7 July 1683) was the daughter of William VI, Landgrave of Hesse-Kassel and Hedwig Sophia of Brandenburg (1623–1683) and electoral princess of Brandenburg through her marriage to Frederick I of Prussia.

[1] Elisabeth Henriëtte was born in Kassel, Germany on 18 November 1661 to William VI, Landgrave of Hesse-Kassel.

[1] She was the youngest of seven; siblings included Queen Charlotte Amalie, William VII, Luise, Charles I, Philip, and George.

[citation needed] She suffered from an unknown illness in 1677 that her mother treated with the milk cure, wherein a teenage Elisabeth suckled from a wet nurse for three weeks and eventually recovered.

[1][4] Frederick accused his stepmother Dorothea of poisoning her but this was found to be untrue via investigation.