| 251 | Prince | Prince Gabriel of NassauPrince | Nassau-Weilburg (House of) | 🇱🇺LU | | Tessy Antony de Nassau | 0 ch. | ~20 |
| 252 | Prince of Liechtenstein | Prince Benedikt of LiechtensteinPrince of Liechtenstein | Liechtenstein (House of) | — | | Prince Constantin of Liechtenstein | 0 ch. | 18 |
| 253 | Prince | Prince Archie of SussexPrince | Windsor (House of) | 🇬🇧GB+1 | | Prince Harry, Duke of Sussex | 0 ch. | 7 |
| 254 | Princess | Princess Lilibet of SussexPrincess | Windsor (House of) | 🇺🇸US+1 | | Prince Harry, Duke of Sussex | 0 ch. | 5 |
| 255 | Prince | James, Earl of WessexPrince | Windsor (House of) | 🇬🇧GB | | Prince Edward, Duke of Edinburgh | 0 ch. | 18 |
| 256 | Princess | Lady Louise WindsorPrincess | Windsor (House of) | 🇬🇧GB | | Prince Edward, Duke of Edinburgh | 0 ch. | 23 |
| 257 | Princess of Kent | Princess Michael of KentPrincess of Kent | Windsor (House of) | 🇦🇹AT+1 | | unknown | 2 ch.Children (no sourced line of succession) | 81 |
| 258 | Prince | Prince Laurent of BelgiumPrince | Saxe-Coburg and Gotha (House of) | 🇧🇪BE | | Albert II of Belgium | 4 ch.Children (no sourced line of succession) | 63 |
| 259 | Princess of Norway | Princess Märtha Louise of NorwayPrincess of Norway | Glücksburg (Norway) (House of) | 🇳🇴NO | | Queen Sonja of Norway | 3 ch.Children (no sourced line of succession) | 55 |
| 260 | Prince | Clément VandenkerckhovePrince | Saxe-Coburg and Gotha (House of) | 🇧🇪BE | | Prince Laurent of Belgium | 0 ch. | 26 |
| 261 | Princess | Princess Louise of BelgiumPrincess | Saxe-Coburg and Gotha (House of) | 🇧🇪BE | | Prince Laurent of Belgium | 0 ch. | 22 |
| 262 | Prince | Prince Aymeric of BelgiumPrince | Saxe-Coburg and Gotha (House of) | 🇧🇪BE | | Prince Laurent of Belgium | 0 ch. | 20 |
| 263 | Prince | Prince Nicolas of BelgiumPrince | Saxe-Coburg and Gotha (House of) | 🇧🇪BE | | Prince Laurent of Belgium | 0 ch. | 20 |
| 264 | Prince of Norway | Prince Sverre Magnus of NorwayPrince of Norway | Glücksburg (Norway) (House of) | 🇳🇴NO | | Haakon VIII | 0 ch. | 20 |
| 265 | Princess of Bourbon-Parmac | Princess Maria Pia of Bourbon-ParmaPrincess of Bourbon-Parma (c) | Savoy (House of) | 🇮🇹IT | | Umberto II of Italy | 4 ch.Children (no sourced line of succession) | 92 |
| 266 | Princess | Princess Sophie, Duchess of ArenbergPrincess | Wittelsbach (House of) | 🇩🇪DE | | Rupprecht, Crown Prince of Bavaria | 5 ch.Children (no sourced line of succession) | 91 |
| 267 | Princess of Yugoslaviac | Princess Elizabeth of YugoslaviaPrincess of Yugoslavia (c) | Karađorđević (House of) | — | | Prince Paul of Yugoslavia | 3 ch.Children (no sourced line of succession) | 90 |
| 268 | Margravine of Meissenc | Princess Anastasia, Margravine of MeissenMargravine of Meissen (c) | Ascania (House of) | 🇩🇪DE | | unknown | 0 ch. | 85 |
| 269 | Princess of Sayn-Wittgenstein-Berleburgc | Princess Tatiana of Sayn-Wittgenstein-BerleburgPrincess of Sayn-Wittgenstein-Berleburg (c) | Hesse (House of) | 🇩🇪DE | | unknown | 4 ch.Children (no sourced line of succession) | 86 |
| 270 | Princess of Prussiac | Princess Marie Cécile of PrussiaPrincess of Prussia (c) | Hohenzollern (House of) | 🇩🇪DE+1 | | Louis Ferdinand, Prince of Prussia | 3 ch.Children (no sourced line of succession) | 84 |
| 271 | Prince | Franz Wilhelm Prinz von PreussenPrince | Hohenzollern (House of) | 🇩🇪DE | | Prince Karl Franz of Prussia | 1 ch.Children (no sourced line of succession) | 83 |
| 272 | Princess of Savoyc | Princess Maria Beatrice of SavoyPrincess of Savoy (c) | Savoy (House of) | 🇮🇹IT | | Umberto II of Italy | 3 ch.Children (no sourced line of succession) | 83 |
| 273 | Princess of Savoy-Genoac | Princess Maria Isabella of Savoy-GenoaPrincess of Savoy-Genoa (c) | Savoy (House of) | 🇮🇹IT | | Prince Eugenio, Duke of Genoa | 4 ch.Children (no sourced line of succession) | 83 |
| 274 | Princess of Hessec | Princess Clarissa of HessePrincess of Hesse (c) | Hesse (House of) | — | | Princess Sophie of Greece and Denmark | 1 ch.Children (no sourced line of succession) | 82 |
| 275 | Prince | Alexander, Crown Prince of YugoslaviaPrince | Karađorđević (House of) | 🇷🇸RS | | Peter II of Yugoslavia | 3 ch.Children (no sourced line of succession) | 81 |
| 276 | Princess | Anni-Frid LyngstadPrincess | Reuss (House of) | 🇸🇪SE | | unknown | 2 ch.Children (no sourced line of succession) | 80 |
| 277 | Princess | Wibke van GunsterenPrincess | Hanover (House of) | — | | unknown | 1 ch.Children (no sourced line of succession) | 77 |
| 278 | Prince | Oskar Prinz von PreussenPrince | Hohenzollern (House of) | 🇩🇪DE | | Wilhelm Karl Prinz von Preussen | 1 ch.Children (no sourced line of succession) | 67 |
| 279 | Princess | Princess Katarina of YugoslaviaPrincess | Karađorđević (House of) | 🇬🇧GB | | Prince Tomislav of Yugoslavia | 1 ch.Children (no sourced line of succession) | 66 |
| 280 | Princess | Clotilde CourauPrincess | Savoy (House of) | 🇫🇷FR | | unknown | 2 ch.Children (no sourced line of succession) | 57 |
| 281 | Prince of Bavariac | Prince Manuel of BavariaPrince of Bavaria (c) | Wittelsbach (House of) | — | | Leopold Prinz von Bayern | 2 ch.Children (no sourced line of succession) | 53 |
| 282 | Princess of Bavariac | Princess Maria del Pilar of BavariaPrincess of Bavaria (c) | Wittelsbach (House of) | — | | Leopold Prinz von Bayern | 0 ch. | 48 |
| 283 | Prince | Prince Peter of YugoslaviaPrince | Karađorđević (House of) | 🇺🇸US | | Alexander, Crown Prince of Yugoslavia | 0 ch. | 46 |
| 284 | Princess | Princess Caroline BonapartePrincess | Bonaparte (House of) | 🇫🇷FR | | Princess Béatrice of Bourbon-Two Sicilies | 0 ch. | 46 |
| 285 | Princess of Bavariac | Princess Maria Felipa of BavariaPrincess of Bavaria (c) | Wittelsbach (House of) | — | | Leopold Prinz von Bayern | 0 ch. | 45 |
| 286 | Prince | Prince Alexander of YugoslaviaPrince | Karađorđević (House of) | 🇺🇸US | | Alexander, Crown Prince of Yugoslavia | 1 ch.Children (no sourced line of succession) | 44 |
| 287 | Prince of Bavariac | Prince Konstantin of BavariaPrince of Bavaria (c) | Wittelsbach (House of) | — | | Leopold Prinz von Bayern | 0 ch. | 40 |
| 288 | Princess | Alessandra de OsmaPrincess | Hanover (House of) | 🇵🇪PE | | unknown | 2 ch.Children (no sourced line of succession) | ~38 |
| 289 | Princess of Serbiac | Princess Marija of SerbiaPrincess of Serbia (c) | Karađorđević (House of) | — | | Prince Nikola of Yugoslavia | 0 ch. | 33 |
| 290 | Princess | Princess Maria-Olympia of Greece and DenmarkPrincess | Glücksburg (House of) | 🇺🇸US | | Pavlos, Crown Prince of Greece | 0 ch. | 30 |
| 291 | Princess | Maria Francisca, Duchess of CoimbraPrincess | Braganza (House of) | 🇵🇹PT | | Duarte Pio, Duke of Braganza | 0 ch. | 29 |
| 292 | Prince of Greece and Denmark | Prince Constantine-Alexios of Greece and DenmarkPrince of Greece and Denmark | Glücksburg (House of) | 🇺🇸US+2 | | Pavlos, Crown Prince of Greece | 0 ch. | 28 |
| 293 | Princess | Princess Vittoria of SavoyPrincess | Savoy (House of) | 🇨🇭CH+1 | | Clotilde Courau | 0 ch. | 22 |
| 294 | Princess of Savoyc | Princess Luisa of SavoyPrincess of Savoy (c) | Savoy (House of) | 🇨🇭CH+1 | | Clotilde Courau | 0 ch. | 20 |
| 295 | Prince | Prince Stefan of YugoslaviaPrince | Karađorđević (House of) | — | | Philip, Hereditary Prince of Yugoslavia | 0 ch. | 8 |
| 296 | Prince | Karl-Ludwig Felix Melchoir Prinz von ArenbergPrince | Arenberg (House of) | 🇧🇪BE | | Princess Sophie, Duchess of Arenberg | 2 ch.Children (no sourced line of succession) | 69 |
| 297 | Prince | Hubertus von HohenlohePrince | Hohenlohe (House of) | 🇱🇮LI+1 | | unknown | 0 ch. | 67 |
| 298 | Princess | Tatiana von FürstenbergPrincess | Fürstenberg (House of) | 🇺🇸US | | Prince Egon von Fürstenberg | 1 ch.Children (no sourced line of succession) | 55 |
| 299 | Prince | Albert von Thurn und TaxisPrince | Thurn and Taxis (House of) | 🇩🇪DE | 35 y 332 d | Johannes von Thurn and Taxis | 0 ch. | 43 |
| 300 | Princess | Talita von FürstenbergPrincess | Fürstenberg (House of) | 🇩🇪DE+1 | | Prince Alexander von Fürstenberg | 0 ch. | 27 |