Keng Vannsak (Khmer: ??? ?????????; 19 September 1925 – 18 December 2008) was a Cambodian scholar, philosopher and Khmer linguist.
He invented the Khmer typewriter keyboard in 1952.
He had lived in exile in Paris, France, from 1970 until his death in 2008.
He died at the age of eighty-three at the hospital of Montmorency in the outskirts of Paris after suffering from a chronic illness.
In modern Cambodia, Keng Vannsak is known for being one of the influential figures for the next generations of Cambodian scholars and intellectuals.
He left behind him a legacy in literature, including two drama plays, short stories, many poems and his research from the 1940s.Known for his left-wing views, he was a member of the radical Democratic Party, and stood unsuccessfully as its MP candidate in the 1955 elections.