Sisowath Watchayavong (Khmer: ស៊ីសុវត្ថិ វឌ្ឍឆាយាវង្ស; 13 September 1891[1] – 30 January 1972) was a Cambodian politician who served as the Prime Minister of Cambodia from 1947 to 1948.

He was a grandson of King Sisowath.

He was appointed to the High Council of the Kingdom in 1967.

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