Grand Duke Nikolay Nikolayevich Romanov of Russia (Russian: Николай Николаевич Романов (младший - the younger)) (November 6, 1856 – January 5, 1929) was a Russian general in World War I. A grandson of Nicholas I of Russia, he was commander in chief of the Russian armies on the main front in the first year of the war, and was later a successful commander in the Caucasus.