Heng Samrin (Khmer: ??? ?????; born 25 May 1934) is a Cambodian politician who serves as the President of the National Assembly of Cambodia.
Between 1979 and 1992, he was the de facto leader of the Hanoi-backed People's Republic of Kampuchea (1979–89) and State of Cambodia (1989–92) and General Secretary of the Kampuchean People's Revolutionary Party from 1981 to 1991.
He has been a member of Parliament since 1993.
At age 85 years, he is Cambodia's oldest parliamentarian.
His honorary title is "Samdech Akeak Moha Ponhea Chakrei Heng Samrin" (Khmer: ????????????????????? ??? ?????).