List of nicknames of European royalty and nobility: D
- Dag of Sweden the Wise
- Dagobert II the Young, the Younger 1, the Saint
- Daisy Greville, Countess of Warwick the Babbling Brooke
- Dalmas of Semur, Lord of Montaigu the Young, the Younger
- Damat İbrahim Pasha the Conqueror of Kanije
- Dan II of Wallachia the Brave
- Dan of Denmark the Magnificent
- Daniel of Moscow the Pacific
- Daniel Finch, 8th Earl of Winchilsea Dismal, Don Diego, Don Dismallo 2
- David I of Scotland the Saint, the Scotch Justinian 3
- David II, King of Abkhazia, 990–1000 the Great
- David II, King of Georgia, 1089–1125 the Restorer
- David IV of Georgia the Builder, the Saint, the Sword of the Messiah
- David VII Ulu the Great, the Strong
- David VI Narin the Cunning
- David, Earl of Huntingdon Guishart
- David of Scotland, 8th Earl of Huntingdon the Knight of the Leopard 4
- David of Scotland the Saint
- David, Viscount Roche of Fermoy the Great
- David Anhoghin, King of Lorhi and Aghbania 982–989 the Landless
- Decebala of Dacia the Brave
- Decius the Barracks Emperor, the Emperor of the Army
- Dedi V, Margrave of Lower Lusatia (1130–1190) the Strong
- Dedo of Wettin the Feisty 5
- Demetre II of Georgia Devout (Georgian Tavdadebuli), the Devoted, ''the Self-Sacrificer"
- Demetrius I of Macedon Poliorcetes (the Bisieger)
- Demetrius Phalereus Demetrius of Phalerum 6
- Denis I of Portugal the Father of the Country, the Farmer 7, the Farmer-King, the Just, the Liberal, the Poet-King, the Troubadour-King 8
- Dermod Mor, King of Desmond, 1151–1185 na-Cill-Baghain
- Dermot MacMurrough Dermot of the Foreigners (Diarmait na nGall), the King of the Foreigners 9
- Dermot II, King of Thomond, 1311-1313 the Cleric 10
- Dermot, King of Leinster, 1361–1368 Lamh-Derg
- Dermot MacMurrough Dermot of the English, Dermot of the Foreigners (ba-nGall)11
- Desa, Grand Zupan of Raška, 1162–1165 Techomil
- Diana, Princess of Wales England's Rose, Lady Di, the Queen of Hearts 12, the Queen of People's Hearts, the People's Princess 13
- Diane d'Andouins, Countess of Graumont la Belle Corisande 14
- Diarmait mac Mail na mBo the Impetuous 15
- Diego Hurtado de Mendoza y Luna, 3rd Duke of Infantado (1461–1531) the Great
- Diego Lopez de Haro, Count of Vizcaya, 1093–1124 the White
- Diego Lopez IV de Haro, Lord of Vizcaya, 1295–1311 the Intruder
- Diego Lopez de Haro, 3rd Lord of Vizcaya and Haro the Good 16
- Diego Rodriguez, Count of Castile Porcelos 17
- Dietrich I, Count in Veluwe (d.1082) the Ruddy
- Dietrich I, Count in Veluwe (d.1082) Flamens, Flaminius
- Dietrich IV, Count of Cleves, 1311–1347 the Pious
- Dietrich V, Count of Cleves, 1193–1260 Dietrich Nust
- Dietrich V of Kleve (1226-1275) the Young, the Younger
- Dietrich, Margrave of Meissen the Oppressed, the Hard-Pressed (Ger. des Bedrängten) 18 19
- Dietrich of Oldenburg the Fortunate
- Dionysius I of Syracuse the Elder
- Dionysius II of Syracuse the Young, the Younger
- Dirk III, Count of Holland the Jerusalem-Farer
- Dmitri I, Prince of Halych and Dmitrov, ?–1364 the Exile
- Dmitri II, Prince of Uglich, 1505–1521 Zhilka
- Dmitri II, Prince of Rostov-Ustretensk, 1380–1389 Primak 20
- Dmitri III, Prince of Uglich, 1584–1591 Donskoi (of the Don)
- Dmitri III, Prince of Uglich, 1584–1591 the Saint
- Dmitri IV, Grand Prince of Moscow (d.1383) the Elder
- Dmitri VI, Grand Prince of Moscow and Tver, 1498–1502 Vnuk
- Dmitry of Pereslavl "la Honte de son Père" (the Shame of His Father)
- Dmitry VI, Grand Prince of Moscow the Grandson 21
- Dmitri Donskoi Dmitri of the Don (River)
- Dmitri of Nizhny Novgorod (1365–1383) the Elder
- Dmitri of Suzdal (fl 1375) Nogotj22
- Dmitri of Tver the Terrible Eyes, the Cruel Eyes, the Menacing Eyes, the Steely-Eyed, With Terrible Eyes
- Dmitri, Prince Glazaty Glazaty 23
- Dmitry of Pereslavl the Hard-Headed, the Vigilant
- Dmitry Shemyaka
- Dobrodjeja Mstislavna of Kiev "Evpraxia ", "Evpraksia": 24 25, Zoia 26 27
- Domagoj of Croatia the Worst Duke of Slavs (Lat. Pessimus Dux Sclavorum) 28
- Domnall I of Ailech, co-King of Ireland, 565–566 the Deceitful
- Domnall I of Dalriada the Freckled
- Domnall II of Dalriada the Brown-Haired, Donn
- Domnall IV ua Neill, High King of Ireland, 956–980 Domnall of Armagh (Ardmacha)
- Donald II of Scotland the Mad
- Donald III of Scotland Donald Bane, the Blond, the White 29
- Domnall Mor, King of Thomond, 1168-1194 the Great
- Domnall of Thomond Connachtach, son of Dronald O'Brien (d.1194), King of Thomond
- Donal Caoch, Prince of Carberry, 1311–1320 the Handsome
- Donal Mor, King of Desmond, 1185–1206 Donal Mor of the Planting (na-Curragh)
- Donal Oge III (1373–1468) the Poet
- Donald III of Scotland the Fair, the Fair Donald
- Donald Cameron the Gentle Lochiel 30
- Donogh, a.k.a. Donnchad, O'Brien, King of Thomond, 1210–1242 Cairbreach
- Donough=Donnchadh (Ramhar) O'Brien (d.1553), 2nd Earl of Thomond the Fat
- Donogh O'Brien, 4th Earl of Thomond the Great Earl 31 32
- Douglas Haig, 1st Earl Haig the Butcher of the Somme" 33 34, the Man Who Won the War 35
- Drahomíra the Arrogant
- Dub of Scotland Duff the Black 36
- Dumnagual I of Alt Clut the Old
- Duncan I of Scotland , the Gracious,the Meek'
- Duncan of Scotland the Glorious
- Duncan, 1st Lord Campbell (1374–1453) Duncan of Lochawe
- Duncan Campbell, 1st Lord Campbell (1374–1453) na-Adh
- Dungal of Dalriada the Impetuous