Johann Friedrich Struensee (August 5, 1737 –  April 28, 1772) is a German doctor.

He becomes royal physician to the mentally-ill King Christian VII of Denmark and a minister in the Danish government.

He rises in power to a position of "de facto" regent of the country, where he tries to carry out widespread reforms.

His affair with Queen Caroline Matilda ("Caroline Mathilde") causes a scandal, especially after the birth of a daughter, Princess Louise Augusta, and is the catalyst for the intrigues and power play that cause his downfall and dramatic death.