The Killing Fields (Khmer: វាលពិឃាត viel pi-kʰiet) are a number of sites in Cambodia where large numbers of people were killed and buried by the Khmer Rouge regime, during its rule of the country from 1975 to 1979, immediately after the end of the Cambodian Civil War (1970–1975).

Analysis of 20,000 mass grave sites by the DC-Cam Mapping Program and Yale University indicate at least 1,386,734 victims of execution.[1][2] Estimates of the total number of deaths resulting from Khmer Rouge policies, including disease and starvation, range from 1.7 to 2.5 million out of a 1975 population of roughly 8 million. In 1979, communist Vietnam invaded Democratic Kampuchea and toppled the Khmer Rouge regime.

Cambodian journalist Dith Pran coined the term "killing fields" after his escape from the regime.