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Semyon Ivanovich Yanovsky (; April 15, 1788 – January 6, 1876) was a Russian naval officer who was appointed in late 1818 as Chief Manager of the Russian-American Company, serving into 1820. He had traveled to Kodiak Island with his commanding officer, Ludwig von Hagemeister, who appointed him to the post. The Russian-American Company conducted trading and colonization based in present-day Alaska. Yanovsky was replaced in 1820 by Matvey Ivanovich Muravyev, who had been selected by the Board of the RAC.