Cheng Heng was a Cambodian politician, who was the country's Head of State from 1970 to 1972, and was a relatively prominent political figure during the Khmer Republic period (1970–1975).

The Khmer Republic was a Cambodian state under the United States-backed military dictatorship of Marshal Lon Nol from 1970 to 1975. Its establishment was formally declared on 9 October 1970, following the 18 March 1970 coup d'état which saw the overthrow of Norodom Sihanouk's government and the abolishment of the Cambodian monarchy.