Nikolai Petrovich Rezanov (Russian: Николай Петрович Резанов, 28 March [O.S. 8 April] 1764 – 13 March [O.S. 1 March] 1807), a Russian nobleman and statesman, promoted the project of Russian colonization of Alaska and California to three successive Emperors of All Russia—Catherine the Great, Paul, and Aleksander I. Aleksander I commissioned Rezanov as Russian ambassador to Japan (1804) with the aim of concluding a commercial treaty. In order to get to his post he was appointed co-commander of the First Russian circumnavigation (1803-1806), led by Adam Johann von Krusenstern. Rezanov left the expedition in 1805 when it returned to Kamchatka after visiting Japan (1804-1805).
Rezanov wrote a lexicon of the Japanese language and several other works, which are preserved in the library of the Saint Petersburg Academy of Sciences, of which he was a member. Rezanov's greatest legacy proved the founding of the Russian-American Company in 1799.