Chau Sen Cocsal (Khmer: ចៅ សែនកុសល; 1 September 1905 – 22 January 2009), also known as "Chhum" (Khmer: ឈុំ), was a Cambodian civil servant and politician. He served as Prime Minister of Cambodia for a short period of time in 1962. Chhum was 103 years, 143 days old at the time of his death. This makes him the oldest lived former Prime Minister.