Yuri Sergeyevich Sergeyev (1843? - March 28, 1911) was an Alaskan politician and soldier, best known for his service in the Alaskan War as one of the chief aides to Boris Anasenko, primarily due to his leadership of the cavalry of the Army of the Pacific. After the war, Sergeyev declined a civilian office under the new leadership formed out of the Dmitrov Coup, feeling weary after years of war and disgusted by the terms of the Treaty of Sofiyagrad. Sergeyev remained a cavalry officer in the army, twice declining more significant promotions, and retired to Siberia in 1904, disillusioned with the Anasenko regime. He died of pneumonia in 1911 at the age of 68.