Admiral Sir Cecil Fiennes Thursby, KCB, KCMG, DL, JP (17 January 1861 – 28 May 1936) was a Royal Navy officer who went on to be Commander-in-Chief, Plymouth, after serving in World War I mainly in the Mediterranean Sea.

[1] In 1890, he earned a certificate from the Royal Humane Society for rescuing a drowning man off Cowes, Isle of Wight.

[2] He commanded the International Squadron in Crete in August 1909,[8] earning thanks from four Great Powers for pacifying the island[2] (which had not long united with Greece) and became Commodore at the Royal Naval Barracks at Chatham later that year.

[3] He commanded the British Adriatic Squadron in 1916, when it helped evacuate retreating Serbian troops,[2] before becoming Commander-in-Chief, East Mediterranean later that year.

[3] In the latter post he was in charge of blockading the Dardanelles and the Turkish and Bulgarian coasts and protecting supply lines to Salonika.