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Vasily Antonovich Kosyakov (1862–1921) was a Russian architect and a specialist of the Neo-Russian and Neo-Byzantine architecture in the Russian Empire. He was the author of the projects of St. Vladimir's Cathedral (Astrakhan), Church of Our Lady the Merciful, Naval Cathedral in Kronstadt, St. Nicholas's Naval Cathedral in Alexander III Harbour in Libava (now Karosta, Liepaja), and others churches in Saint Petersburg.
He is buried at Novodevichy Cemetery (Saint Petersburg).