Alexey Ivanovich Nagayev (Russian: Алексей Иванович Нагаев, March 17, 1704, Sertyakino - January 8, 1781, Saint Petersburg) was a Russian hydrographer, cartographer and an admiral.

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Alexey Ivanovich Nagayev
1909 depiction
Native name	Алексей Иванович Нагаев
Born	17 March 1704 Sertyakino, Tsardom of Russia
Died	8 January 1781 Saint Petersburg, Russian Empire
Allegiance	Tsardom of Russia  Russian Empire
Service/branch	Imperial Russian Navy
Rank	Admiral
Commands held	32-gun frigates "Chevalier" and "Mercurius" 66-gun ship "Fridemaker" Russian Hydrographic Service
Awards	Order of Saint Alexander Nevsky Order of Saint Anna

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Born in a family of the lesser nobility, he graduated from the Saint Petersburg Naval Academy and later found employment there. During the Seven Years' War Nagayev headed the hydrographic expedition to the Prussian shores. He also compiled the first atlases of the Bering Sea and Baltic Sea, which were published in 1752. Despite the absence of a meridian grid, Nagayev's maps were used for a further fifty years. In 1764-65 Nagayev became the supreme commander of the Kronstadt port. He was promoted to the rank of admiral in 1769.

A bay in the Okhotsk Sea is named after him.

• Order of Saint Alexander Nevsky
• Order of Saint Anna

• Russian Hydrographic Service

• Great Soviet Encyclopedia (1974), vol. 17, p. 196
• Сухарева, О.В. Кто был кто в России от Петра I до Павла I, Москва, 2005