Duke Christian August of Holstein-Gottorp (1706-1756) was a German nobleman and a member of the House of Holstein-Gottorp. He served as the Duke of Holstein-Gottorp from 1726 until his death. His reign was marked by efforts to modernize his duchy and improve its economy, particularly through agricultural reforms. Christian August is also known for his connections to the Russian Empire, as he was the father of Catherine the Great, who became one of Russia's most prominent rulers. His lineage and political alliances played a significant role in shaping the history of Northern Europe during the 18th century.