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, Infante Afonso, Duke of Porto, Frederick Augustus III of Saxony, and Princess Maria Josepha of Saxony.
Between 1880 and 1886, William was heir presumptive to the Romanian throne.
On 20 December 1886, he renounced his rights to the throne in favor of his brother Ferdinand.