Chau Sen Cocsal (Khmer: ចៅ សែនកុសល; 9 September 1905 – 22 January 2009), also known as "Chhum" (Khmer: ឈុំ), was a Cambodian civil servant and politician who served as interim Prime Minister of Cambodia in 1962 and President of the National Assembly twice in 1962–63 and 1966–68. Having lived for 7009326209680000000♠103 years, 135 days, he is the oldest lived Prime Minister of Cambodia and the longest-lived leader of a nation in recorded history.