Count Grigory Kirillovich Razumovsky (Russian: Григорий Кириллович Разумовский; Ukrainian: Григорій Кирилович Розумовський; November 10, 1759 – June 3, 1837) was a Russian nobleman, political philosopher, botanist, zoologist and geologist.

Razumovsky is known from his writings in the West as Gregor or Grégoire, who lost his Russian citizenship for openly criticizing the czarist system under emperor Alexander I, which he saw as pandering to the desires of a corrupt oligarchy of nobles.

Gregor emigrated to western Europe, where was subsequently incorporated into the Bohemian nobility (Inkolat im Herrenstande) in 1811 and accorded the rank of count of the Austrian Empire.

As a natural scientist, Gregor was the first to describe and classify Lissotrion helveticus.

[1] In 1788, he was elected a foreign member of the Royal Swedish Academy of Sciences.