Johann Friedrich, Greve Struensee (5 August 1737 – 28 April 1772) was a German doctor.
He became royal physician to the mentally ill King Christian VII of Denmark and a minister in the Danish government.
He rose in power to a position of "de facto" regent of the country, where he tried to carry out widespread reforms.
His affair with Queen Caroline Matilda ("Caroline Mathilde") caused a scandal, especially after the birth of a daughter, Princess Louise Augusta, and was the catalyst for the intrigues and power play that caused his downfall and dramatic death.