| Native Name: | อาสา สารสิน |
| Native Name Lang: | th |
| Office: | His Majesty's Principal Private Secretary |
| Termstart: | 1 August 1999 |
| Termend: | 30 September 2012 |
| Predecessor: | Peerapong Kasemsri |
| Successor: | Krit Kanjanakunchon |
| Office1: | Minister of Foreign Affairs |
| Primeminister1: | Anand Panyarachun |
| Termstart1: | 10 June 1992 |
| Termend1: | 22 September 1992 |
| Predecessor1: | Pongpol Adireksarn |
| Successor1: | Prasong Soonsiri |
| Termstart2: | 6 March 1991 |
| Termend2: | 22 March 1992 |
| Primeminister2: | Anand Panyarachun |
| Predecessor2: | Arthit Ourairat |
| Successor2: | Pongpol Adireksarn |
| Birth Date: | 26 May 1937 |
| Birth Place: | Phra Nakhon, Siam |
| Spouse: | Sujitkhun Kitiyakara |
| Children: | 3 |
Arsa Sarasin (th|อาสา สารสิน; born 26 May 1937) is a Thai diplomat and businessman who served as Principal Private Secretary to King Bhumibol Adulyadej until he retired in 2012.[1]
Arsa Sarasin was the son of former Prime Minister of Thailand Pote Sarasin and his wife, Thanpuying Siri Sarasin. He was one of three brothers, including Pao Sarasin and Pong Sarasin. Arsa Sarasin graduated from Bangkok Christian College, a private boys' school in Bangkok and Dawlish Primary School in London. He then moved to the United States, where he study High school at Wilbraham & Monson Academy and received a bachelor's degree from Boston University.
From 1977 to 1979, he was firstly appointed as Thailand's ambassador to Belgium. Then, around two to three years later from 1982 to 1985, he was Permanent Secretary of the Ministry of Foreign Affairs and from 1985 to 1988 he was appointed ambassador to the United States.
From 1999 to 2012, he was Principal Private Secretary to King Bhumibol Adulyadej, responsible for aiding the monarch in the exercise of his official duties and relations with the government.[2] He has sat on the boards of the family-owned Thai Pure Drinks Company, as well as the Siam Cement Group, Charoen Pokphand Foods, Dusit International, and Bangkok Dusit Medical Services.[3] [4]
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