Admiral of the Fleet Prayoon Yuthasastrkosol
ประยูร ยุทธศาสตร์โกศล
Deputy Prime Minister of Thailand
In office 21 March 1957 – 16 September 1957
Prime Minister	Plaek Phibunsongkhram
Minister of Culture
In office 2 August 1955 – 16 September 1957
Prime Minister	Plaek Phibunsongkhram
Preceded by	Sunawinwiwat
Succeeded by	Pin Malakul
Minister of Cooperatives
In office 24 March 1952 – 1 August 1955
Prime Minister	Plaek Phibunsongkhram
Minister of Agriculture
In office 6 December 1951 – 23 March 1952
Prime Minister	Plaek Phibunsongkhram
Preceded by	Pholasinthanawat
Succeeded by	Chamnanarthayutha
Commander in Chief of the Royal Thai Navy
In office 1 December 1951 – 19 September 1957
Preceded by	Pholasinthanawat
Succeeded by	Chamnanarthayutha
Personal details
Born	(1893-09-19)19 September 1893 Siam
Died	11 December 1975(1975-12-11) (aged 82) Thailand
Spouse	Prayoon Jansawad
Alma mater	Royal Thai Naval Academy
Military service
Allegiance	Thailand
Branch/service	Royal Thai Navy
Years of service	1951-1957
Rank	General Admiral of the Fleet Air Chief Marshal[1]

Luang Yuthasastr Kosol (Thai: หลวงยุทธศาสตร์โกศล, personal name Prayoon Yuthasastrkosol, 19 October 1893 – 11 December 1975) was a Commander of the Royal Thai Navy.^[2]

Prayoon joined the Royal Thai Naval Academy on 18 April 1919, and continued his studies at Thai Naval War College in 1932, where his fraternity brothers dubbed him "The professor", a nickname he kept throughout his navy career. Prayoon served in the Royal Thai Navy from 1932 to his retirement in 1957 in many positions:

• Commander in Chief of the Royal Thai Navy
• Admiral of the Fleet in the Royal Thai Navy
• General in the Royal Thai Army Air Force
• Air Chief Marshal in the Royal Thai Air Force
• Deputy Prime Minister
• Minister of Agriculture
• Minister of Cooperatives
• Minister of Culture
• Secretary of the Ministry of Defense

Among several official visits, Luang Yuthasastr Kosol represented Thailand in Spain, Italy, Japan, Switzerland, France, Belgium, Norway, Sweden, Denmark, USA, Taiwan and Hong Kong. In 1953, Luang Yuthasastr Kosol led the Naval Parade for the Queen’s Coronation held in the United Kingdom.

During his last years of service, Prayoon undertook several agricultural projects such as the creation of a secured and self-managed market by parboiled rice farmers, including increased marketing opportunities and refrigeration as well as rural reconstruction of liquid gas propane, and rubber industry. An oil refinery in cooperation with American Petroleum Export Company through the flotation of a bond issue to fund the project and the initiation of the deep-sea port in Si Racha District.

• Knight Grand Cordon of the Most Exalted Order of the White Elephant
• Knight Grand Cordon of the Most Noble Order of the Crown
• Knight Grand Commander of the Most Illustrious Order of Chula Chom Klao
• Victory Medal - Franco-Thai War
• Safeguarding the Constitution Medal
• Medal for Service Rendered in the Interior - Pacific War
• Chakra Mala Medal
• King Rama IX Royal Cypher Medal
• King Rama VI Rajaruchi Medal
• King Rama VI Coronation Medal
• King Rama VII Coronation Medal
• King Rama IX Coronation Medal
• Commemorative Medal on the Occasion of the 150th Years of Rattanakosin Celebration

•  Nazi Germany :
  • Order of the German Red Cross, Third Class
•  Italy :
  • Commander of the Order of Merit of the Italian Republic
•  France :
  • Commander of the Legion of Honour
•  Japan :
  • Order of the Sacred Treasure, Third Class
•  UN :
  • United Nations Service Medal Korean
•  Kingdom of Laos :
  • Grand Cross of the Order of the Royal Statue
  • Grand Cross of the Order of the Million Elephants and the White Parasol
•  Cambodia :
  • Grand Cross of the Royal Order of Sahametrei
•  Burma :
  • Grand Commander of the Order of the Union of Burma - Military