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Georg Heinrich von Langsdorff, Baron de Langsdorff (April 8, 1774 – June 9, 1852) was a German-Russian naturalist and explorer, as well as a Russian diplomat, better known by his Russian first name, Grigori (Gregory) Ivanovitch. He was a member and correspondent of the Russian Imperial Academy of Sciences and a respected physician, graduated in medicine and natural history at the University of Göttingen, Germany.

Langsdorff first participated as naturalist and physician in the great Russian scientific circumnavigation expedition commanded by Ivan Fedorovich Kruzenshtern, from 1803 to 1805. He left the expedition in Kamchatka to explore the Aleutians, Kodiak and Sitka; and returned from San Francisco by ship to Siberia and thence to Saint Petersburg by land, arriving in 1808.