At least 3 ships of the Imperial Russian Navy have been named Imperator Nikolai I after the Tsar Nicholas I of Russia.
- 111-gun steam-powered ship of the line that served with the Baltic Fleet; stricken in 1874. - captured during the Battle of Tsushima in 1905 by the Japanese and renamed Iki. Sunk as a target ship in 1915. - Dreadnought whose construction at Nikolayev was interrupted by World War I and scrapped in 1927.