Ernst August, Prince of Hanover (German: Ernst August Albert Paul Otto Rupprecht Oskar Berthold Friedrich-Ferdinand Christian-Ludwig Prinz von Hannover Herzog zu Braunschweig und Lüneburg Königlicher Prinz von Großbritannien und Irland; born 26 February 1954), is head of the royal House of Hanover which held the thrones of the United Kingdom until 1901, of the former Kingdom of Hanover until 1866, and of the sovereign Duchy of Brunswick from 1913 to 1918.
As the husband of Princess Caroline of Monaco, he is the brother-in-law of Albert II, Prince of Monaco.