The Cambodian People's Party (CPP) is a Cambodian political party which has ruled Cambodia since 1979. Founded in 1951, it was originally known as the Kampuchean People's Revolutionary Party (KPRP).

During the Cold War it adopted a revisionist view of Marxism and allied itself with Vietnam and the Soviet Union, in contrast to the pro-Chinese Communist Party of Kampuchea led by Pol Pot. After toppling the Khmer Rouge regime with the Vietnamese-backed liberation of Phnom Penh, it became the ruling party of the People's Republic of Kampuchea (1979–1989), which was later renamed the State of Cambodia (1989–1991). The party's current name was adopted during the final year of the State of Cambodia, when the party abandoned the one-party system and Marxism–Leninism.

Originally rooted in communist and Marxist–Leninist ideologies, the party took on a more reformist outlook in the mid-1980s under Heng Samrin. In 1991, the CPP officially dropped its commitment to socialism, and has since embraced a mixed economy and conservative authoritarianism. Along with the major parties of the European centre-right, the CPP is a member of the Centrist Democrat International.