Rear-Admiral Hubert Edward Dannreuther, DSO (12 December 1880 – 12 August 1977) was a British admiral and one of six survivors of the sinking of HMS Invincible during the battle of Jutland.
Hubert Dannreuther was born the son of the German pianist Edward Dannreuther and Chariclea Anthea Euterpe (Ionides) Dannreuther (1844–1923). He was a godson of Richard Wagner. His eldest brother Tristan Dannreuther (1872–1963) also served as an officer in the Royal Navy, and was an Assistant Director of Naval Intelligence after WWI.
He joined HMS Britannia as a naval cadet in 1895. After being made chief naval cadet in 1896 he was sent to the Australia station as a midshipsman on board HMS Flora. In Australia he served on HMS Orlando and HMS Royal Arthur, and was promoted to sub-lieutenant on 15 October 1900. He served on HMS Doris in the Channel Fleet from late Spring 1902, and was promoted to lieutenant on 15 October 1902. He was from 1911 to 1912 gunnery officer on board HM