Prince Adalbert of Prussia (Heinrich Wilhelm Adalbert) (29 October 1811 in Berlin – 6 June 1873 in Karlsbad) was a son of Prince Wilhelm of Prussia and Landgravine Marie Anna of Hesse-Homburg. He was a naval theorist and admiral. He was instrumental during the Revolutions of 1848 in founding the first unified German fleet, the Reichsflotte. During the 1850s he helped to establish the Prussian Navy. Adalbert was the son of Prince William, the youngest brother of King Frederick William III.