HMS Aboukir was a Cressy-class armoured cruiser built for the Royal Navy around 1900. Upon completion she was assigned to the Mediterranean Fleet and spent most of her career there. Upon returning home in 1912, she was placed in reserve. Recommissioned at the start of the First World War, she played a minor role in the Battle of Heligoland Bight a few weeks after the beginning of the war. Aboukir was sunk by the German submarine U-9, together with two of her sister ships, on 22 September 1914; 527 men of her complement died.