Keng Vannsak (Khmer: កេង វ៉ាន់សាក់, Kéng Vănsăk [keːŋ ʋansak]; 19 September 1925 – 18 December 2008) was a Cambodian scholar, philosopher and Khmer linguist. He invented the Khmer typewriter keyboard in 1952. He 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. Along with Iv Koeus and Khuon Sokhamphu, Keng Vannsak was one of the three pioneers of Khmer linguistics and grammar.