|Prince of Hohenzollern|
|Head of the Princely House of Hohenzollern|
|Tenure||8 June 1905 – 22 October 1927|
|Born||7 March 1864|
Schloss Benrath, near Düsseldorf, Rhine Province, Prussia
|Died||22 October 1927 (aged 63)|
Sigmaringen, Province of Hohenzollern, Germany
(m. 1889; died 1909)
|Issue||Augusta Victoria, Queen of Portugal|
Frederick, Prince of Hohenzollern
Francis Joseph, Prince of Hohenzollern-Emden
|Father||Leopold, Prince of Hohenzollern|
|Mother||Infanta Antónia of Portugal|
William, Prince of Hohenzollern (German: Wilhelm August Karl Joseph Peter Ferdinand Benedikt Fürst von Hohenzollern) (7 March 1864 in Schloss Benrath, near Düsseldorf – 22 October 1927 in Sigmaringen) was the eldest son of Leopold, Prince of Hohenzollern and Infanta Antónia of Portugal.
William was an older brother of Ferdinand of Romania. His maternal first cousins included (among others) Carlos I of Portugal, Albert I of Belgium, Frederick Augustus III of Saxony, and Princess Maria Josepha of Saxony.
On 27 June 1889, William married Princess Maria Teresa of Bourbon-Two Sicilies. Her parents were Prince Louis, Count of Trani and Mathilde Ludovika, Duchess in Bavaria. Louis was the eldest son of Ferdinand II of the Two Sicilies and his second wife Archduchess Maria Theresa of Austria. Mathilde was the fourth daughter of Maximilian, Duke in Bavaria and Princess Ludovika of Bavaria. William and Maria Teresa had three children:
- Augusta Victoria of Hohenzollern (19 August 1890 – 29 August 1966). Married first Manuel II of Portugal and secondly Robert, Count Douglas.
- Prince Frederick Victor of Hohenzollern (30 August 1891 – 6 February 1965). Married Princess Margarete Karola of Saxony. She was a daughter of Frederick Augustus III of Saxony and Archduchess Luise, Princess of Tuscany.
- Prince Francis Joseph of Hohenzollern, adopted the title Prince of Hohenzollern-Emden (30 August 1891 – 3 April 1964). He married Princess Maria Alix of Saxony, also a daughter of Frederick Augustus III of Saxony and Archduchess Luise, Princess of Tuscany.
William succeeded his father as Prince of Hohenzollern on 8 June 1905. Maria Teresa died on 1 May 1909.
Having become familiar with the situation in Romania, the 22-year-old William renounced all rights to the succession of the kingdom (since 1881) of Romania by a letter in French dated on 20 December 1886.
- German decorations
- Hohenzollern-Sigmaringen: Cross of Honour of the Princely House Order of Hohenzollern, 1st Class with Swords
- Grand Cross of Henry the Lion
- War Service Cross
- Ernestine duchies:
- Hesse and by Rhine:
- Oldenburg: Grand Cross of the Order of Duke Peter Friedrich Ludwig, with Golden Collar and Crown
- Saxe-Weimar-Eisenach: Grand Cross of the White Falcon
- Saxony: Knight of the Rue Crown
- Württemberg: Grand Cross of the Württemberg Crown, with Swords
- Foreign decorations
- Kingdom of Romania:
- Belgium: Grand Cordon of the Order of Leopold
- Principality of Bulgaria: Grand Cross of St. Alexander
- Kingdom of Greece: Grand Cross of the Redeemer
- Kingdom of Italy: Knight of the Annunciation, 28 October 1913
- Holy See: Grand Cross of the Holy Sepulchre of Jerusalem
- Sovereign Military Order of Malta: Bailiff Grand Cross of Honour and Devotion
- Ottoman Empire: Order of the Medjidie, 1st Class
- Kingdom of Portugal:
- Russian Empire: Knight of St. Andrew
- Tunisia: Grand Cordon of the Order of Glory
- United Kingdom: Bailiff Grand Cross of St. John (expelled in 1915)
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|Ancestors of William, Prince of Hohenzollern|
- Renunciation letter of Guillaume de Hohenzollern, in French, dated on 20 December 1886
- (in French) Gheorghe Bengescu (1907)- Bibliographie franco-roumaine depuis le commencement du XIXe siècle jusqu'à nos jours.
- "Weimar Constitution of 1919". Cornell University. July 12, 2020.
- Renunciation letter of Leopold de Hohenzollern, in French, dated on 22 November 1880"
- Handbuch über den Königlich Preußischen Hof und Staat (1918), Genealogy p.6
- Justus Perthes, Almanach de Gotha 1922 (1922) p. 77
- Hof- und Staats-Handbuch des Herzogtums Anhalt (1894), "Herzogliche Haus-Orden Albrecht des Bären" p. 17
- Hof- und Staats-Handbuch des Großherzogtum Baden (1896), "Großherzogliche Orden" pp. 62, 77
- Hof- und Staats-Handbuch des Königreich Bayern (1906), "Königliche Orden" p. 9
- Staatshandbücher für das Herzogtum Sachsen-Coburg und Gotha (1890), "Herzogliche Sachsen-Ernestinischer Hausorden" p. 46
- Handbuch über den Königlich Preussischen Hof und Staat, 1908, p. 5
- "Ritter-Orden", Hof- und Staatshandbuch der Österreichisch-Ungarischen Monarchie, 1918, pp. 51, 55, 74, retrieved 5 July 2020
- Italy. Ministero dell'interno (1920). Calendario generale del regno d'Italia. p. 58.
- "Real y distinguida orden de Carlos III". Guía Oficial de España (in Spanish). 1910. p. 160. Retrieved 4 July 2020.
- "The Book of Kings: A Royal Genealogy" by C. Arnold McNaughton.
William, Prince of Hohenzollern
Cadet branch of the House of HohenzollernBorn: 7 March 1864 Died: 22 October 1927
| Prince of Hohenzollern
8 June 1905 – 22 October 1927