Admiral Sir Thomas Jackson, KBE, CB, MVO (20 February 1868 – 7 July 1945) was a senior Royal Navy officer during World War I.

He was promoted to commander on 31 December 1899,[3] and in early 1900 was posted in lieu of a lieutenant to the pre-dreadnought battleship HMS Revenge,[4] stationed in the Fleet Reserve at Chatham Dockyard.

[5] During the Russo-Japanese War, Jackson was a military observer stationed on the Imperial Japanese Navy cruiser Azuma, and was present at the Battle of Tsushima.

[8] He played a key role in the Battle of Jutland in May 1916, providing Admiral Jellicoe with incorrect information that the German High Seas Fleet appeared to have remained in harbour.

[9] Promoted to rear admiral in June 1916,[6] he was made Flag Officer, Egypt & The Red Sea in July 1917.