List of nicknames of European royalty and nobility: N-O
N
- Napoleon I of France Boney, Corporal Violet, Father Violet, Jupiter Scapin,
Napoglione Paille au Nez (Napoleon Straw-in-the-Nose): , That Corsican Ogre, the Armed Soldier of Democracy, the Corsican General
, the Emperor of Elba, the Enlightened Despot, the Great, the Horse Thief of Berlin
, the Little Corporal
, the Little Corsican
, the Little General, the Man of Destiny , the Modern Alexander, the Modern Hannibal, the Nightmare of Europe
, the Ogre, the Representative (of) Men, the Straw-in-the-Nose (Fr. Paille au Nez)
, the Victor of Marengo
- Napoleon II of France the Baby Eagle, the Eaglet

- Napoleon III of France Boustrapa , Comte d'Arenenberg Conscience Tranquelle, Little Napoleon the Small, Grosbec (Nosey) et.html], Ratipole, Ratipol, Verhuel, the Arbiter of Europe, the Arch-monarch of the World, Badinguet, the Little, the Small, the Man of December , the Man of Sedan, the Sedantaire , the Man of the Third Republic, the Man of Silence
, the Socialist on Horseback
- Napoleon Joseph Charles Paul Bonaparte Craint Plomb (Fear-Lead), Plon-Plon

- Natasha the Old the Old
- Naya of Malaga the Usurper

- Nero the Olympic Champion

- Nero Claudius Drusus the Elder
- Nerva the Adoptive Emperor
- Nest verch Rhys the Helen of Wales, the Helen of Troy of Wales
- Nevşehirli Damat İbrahim Pasha Nevşehirli (From Nevşehirli")
- Niall of the Nine Hostages Niall of the Nine Hostages (Noiggiallach)

- Niall III of Ailech, 36th King of Ireland Caille
- Niall Glúndub Black Knee, Glundubh

- Niall, King of Ulster, 1364–1394 the Big
- Niall, King of Ulster, 1394–1403 the Younger
- Niall More O'Neill, Lord of Tyrone the Destroyer of the English, the Exalter of the Church
, the Uniter of the Irish

- Niall Frossach of the Showers
- Niall O'Neill, King of Ulster, 1230 the Red
- Niall of the Nine Hostages the Great
- Nicephorus I the Alarmed, the General, the Great Logothete, the Logothete
- Nicephorus II, Byzantine Emperor the Pale Death of the Saracens

- Nicephorus III, Byzantine Emperor Botaniates
- Nicholas I of Montenegro the Father-in-law of Europe
- Nicholas I of Russia the Don Quixote of Russian Absolutism
, the Iron Czar
, the Iron Emperor
, the Policeman of Europe, the Iron Hand

- Nicholas II of Russia Bloody Nicholas, the Martyr
- Nicholas III Radziwill, Prince of Goniadz and Medely Poland's Darling (Amor Poloniae):
- Nicholas, Lord of Avesnes the Handsome

- Nicholas, Duke of Mecklenburg in Rostock, 1282–1314 the Child
- Nicholas of Silesia "The Little", "Small"
- Niccolò II d'Este the Cripple, the Lame

- Nicolas Jean de Dieu Soult Premier Manœuvrier de l'Europe , the Iron-Arm , the Iron Hand
, the Iron Marshal , the Duke of Damnation
, le Roi Nicolas
- Nicolas Oudinot the Marshal With Thirty-Five Wounds , the Modern Bayard , the Most Wounded Marshal
, the Bayard of the French Army
- Nicolas of Estouteville (d.1416), Lord of Torcy Colart

- Nigel d'Aubigny (1066–1129) Scutifer Conquestoris
- Nikola Zrinski the Poet-Warlord

- Nikolaus II Priscus Radziwiłł Mathusalem

- Nikolaus III Radziwiłł Amor Poloniae

- Nikolaus Esterházy the Lover of Splendor
, the Magnificent
- Nino Visconti the Brigand

- Nithard Nithard of Ponthieu, the Chronicler, the Historian
- Nivelon I, Count of Autun (d.768) the Historian
- Nuño González, Lord of Lara (d.1275)
- Nuño Nuñez of Castile He of Brasera, He of Branosera (Sp. El de Brasera, El de Branosera)

- Nuño Nuñez, Count of Castile He of Castrogeriz (Sp. El de Castrogeriz)

- Nuno Álvares Pereira the Constable-Saint, the Count-Saint, the Holy Constable, the Portuguese Cid

- Nuño Nuñez of Castile He of Roa, Rasura

- Nuño Nuñez of León, Count of Amaya, c.954 Rasura
- Nuño of Leon Belchides, son of Ordoño I of Leon
- Nuno Álvares Pereira the Great Constable
O
- Oberto, Margrave of Massa and Corsica Brattoporrata, Brotoporrada

- Obizzo, Margrave, c1108 Malnitpore

- Ocko I of East Frisia the Elder
- Ocko II, Count of East Frisia the Younger
- Odet de Coligny Cardinal de Chatillon, the Protestant Cardinal

- Odette de Champdivers la Petite Reine
- Odo II of Blois le Champenois

- Odo, Count of Paris Capet
- Odo, Count of Valois (d.c.1085) the Mad
- Odo of Apulia the Good Marquis
- Odo of Aquitaine the Great
- Oddone (d.1104) Altasapada

- Olaf I of Denmark le Famelique, Olaf Hunger
- Olaf I of Norway the Sleeper, the Sleeping Hero, the Sleeping King
- Olaf I of the Isle of Man Morsel, the Dwarf
- Olaf II of the Isle of Man the Black

- Olaf Cuaran Hairy Brogues, Sandals

- Olaf Haraldsson Geirstadalf Olaf II, King of Vestfold and Jutland, the Elf of Geirstad (Nor. Geristad-alf, Geirstada-Alf, Geirstadaalf)
- Olaf Ingjaldsson, King of Dublin (835–871) the White
- Olaf of Denmark the Mild
- Olav I, King of the Isle of Man, 1097–1153 the Red
- Olav II of Norway the Big One, Digera, the Chapman, the Fat, the Saint, the Seaman
- Olav III of Norway the Mild, the Pacific
- Olav IV of Norway Harefoot
- Olav V of Norway the People's King
- Oleg I, Prince of Novgorod-Severskiy, 1097–1115 the Infamous
- Oleg I, Prince of Riazan, 1252–1258 Krasniy, the Fair, the Handsome

- Oleg II, Prince of Riazan, Grand Prince of Riazan, 1389–1402 the Great
- Oleg of Novgorod the Knowing, the Seer, the Wise
- Oleg Svyatoslavich, Prince Chernigov Gorislavich

- Olga of Kiev Preskasa, the Beauty, the Saint

- Oliver Cromwell Crum-Hell, Ironsides , Nosey, Old Ironsides, Old Noll, Ruby Node, the Almighty Nose, the Archangel Who did Battle with the Devil, the Lord Protector of the Commonwealth

- Olivier de Clisson the Butcher
- Oliver St John the Dark Lanthorn of the Commonwealth

- Olof of Sweden the Lap King , the Tax King, the Treasurer''

- Olof Trätälja the Tree-Cutter, the Tree-Hewer, the Tree-Feller, the Wood-Cutter

- Olof the Sharp-sighted
- Ordoño IV of Leon the Bad, the Hunchback
- Orhan I the Fighter, the Hero of the Religion, the Leader, the Ruler, the Warrior of the Faith

- Orielda of Tirel the Noble Lady, wife of Fulk de Tirel, son of Ralph, Lord of Tirel and Poix
- Orlando of Fidenza the Magnificent
- Orlando Pallavicini (c1393-1457) the Magnificent

- Oshin of Armenia the Regent
- Osman I Little Osman, the Black, the Dark, the Fighter, the Founder, the Holy Warrior, the Pride of the Religion

- Osman I, King in Bithynia, 1282–1326 the Warrior of the Faith
- Osman II Farisi, the Martyr, the Younger, the Young Osman

- Oswald of Northumbria the Saint
- Oswine of Deira the Saint
- Ottar of Sweden Wend-crow
- Ottaviano degli Ubaldini the Cardinal

- Otto I of Bohemia (d.1091), Duke of Olmutz the Handsome
- Otto I, Count of Guelders (1150–1207) the Great
- Otto I, Duke of Brunswick-Göttingen, 1367–1394 the Evil
- Otto I, Duke of Brunswick-Lüneburg (1204–1252) the Child
- Otto I, Duke of Brunswick-Luneburg, 1434–1445 the Lame
- Otto I, Duke of Saxony the Magnificent
- Otto I, Holy Roman Emperor the Great
- Otto II, Count of Habsburg
- Otto II (VI), Duke of Brunswick-Göttingen, 1367–1394 the Bad
- Otto II, Duke of Brunswick-Luneburg the Generous, the Liberal, the Magnanimous, the Victorious
- Otto II, Duke of Luneburg, 1464–1471 the Magnificent
- Otto II of Guelders Horsefoot

- Otto II, Holy Roman Emperor the Bloody, the Red (Rufus)

- Otto II, Margrave of Brandenburg (1147–1205) the Spendthrift, the Extravagant
- Otto II, Marquess of Montferrat, 1372–1378 Secondotto
- Otto II Wittelsbach, Duke of Bavaria the August, the Noble
- Otto III, Duke of Swabia Otto of Schweinfurt, the White
- Otto III, Margrave of Brandenburg, 1220–1267 the Pious
- Otto III, Holy Roman Emperor the Infant, the Wonder of the World, the World's Wonder, Stupor Mundi
- Otto IV of Brandenburg Otto with the Arrow, Sagittarius
- Otto IV, Holy Roman Emperor Otto of Brunswick, the Proud
- Otto IV of Kirchberg the Great
- Otto IV, Duke of Bavaria der Abbacher
- Otto V, Duke of Bavaria, the Bavarian, the Lazy, the Pimple
- Otto of Austria the Well-Beloved, the Merry
- Otto, Duke of Brunswick-Göttingen, 1394–1463 the Blind
- Otto of Austria the Wise
- Otto of Bamberg the Father of Monks
, the Saint 
- Otto of Nordheim Otto of Northeim
- Otto von Bismarck the Founding Father, the Man of Blood and Iron , the Iron Chancellor

- Otto-Henry, Duke of Burgundy the Great
- Ottokar I of Bohemia the Victorious
- Ottokar II of Bohemia the Great, the Iron King, the Iron and Gold King, the King of Gold and Iron

- Owain Goch ap Gruffydd the Red
- Owain Danwyn the White Tooth
- Owain ap Thomas, Prince of Gwynedd the Red Hand

- Owain Lawgoch Owain of the Red Hand