Georg Heinrich Freiherr von Langsdorff was a German naturalist and explorer, as well as a Russian diplomat, better known by his Russian name, Grigori Ivanovich Langsdorf.
He was a naturalist and physician on the First Russian circumnavigation from 1803 to 1805. Later Langsdorff was nominated consul general of Russia in Rio de Janeiro, Brazil. From there he organized expeditions to Minas Gerais and the Langsdorff Expedition to the Amazon rainforest, which lasted from 1825 to 1829.