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Joh Knowles Im Thurn
Born (1881-03-07)March 7, 1881
Died July 5, 1956(1956-07-05) (aged 75)
Allegiance United Kingdom United Kingdom
Service/branch Naval Ensign of the United Kingdom Royal Navy
Years of service 1895–1935
Rank Vice Admiral
Battles/wars World War I
Awards Companion of the Order of the Bath
Companion of the Order of St Michael and St George
Commander of the Order of the British Empire

Vice Admiral John Knowles Im Thurn, CB CMG CBE (7 March 1881 – 5 July 1956) was a British Royal Navy officer who was Assistant Chief of the Naval Staff from 1931 to 1933.


Im Thurn joined the Royal Navy in January 1895, and was promoted to the rank of lieutenant on 15 January 1902.[1] In August that year he was posted to the torpedo boat depot ship HMS Vulcan, serving on the Mediterranean Station.[2] He served in the First World War, mainly with wireless telegraph and signalling duties, and was promoted to the rank of captain on 30 June 1918. After the war he held several staff appointments, as Assistant Director of Electrical Torpedo and Mining until 1920, then Director of the Signal Department until 1921.

He was captain of the HMS Hood from 1923 to 1925, during which time the ship participated in a promotional tour of various ports around the world, the World Cruise of the Special Service Squadron.[3]

In March 1931 he was appointed Assistant Chief of the Naval Staff, a senior appointment in the Royal Navy. He served in this position until 1933, when he was appointed commanding officer of the 1st Cruiser Squadron in the Mediterranean Fleet.

He was promoted to vice-admiral in January 1935, and retired from service later the same year.


Im Thurn was married to Margaret Elizabeth Flemming.


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Military offices
Preceded by
Rear-Admiral Wilfred Tomkinson
Assistant Chief of the Naval Staff
Succeeded by
Rear-Admiral Sidney Bailey

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