The Gang of Four (simplified Chinese: 四人帮; traditional Chinese: 四人幫; pinyin: Sìrén bāng) was a political faction composed of four Chinese Communist Party officials. They came to prominence during the Cultural Revolution (1966–76) and were later charged with a series of treasonous crimes. The gang's leading figure was Jiang Qing (Mao Zedong's last wife). The other members were Zhang Chunqiao, Yao Wenyuan, and Wang Hongwen.

The Gang of Four controlled the power organs of the Communist Party of China through the later stages of the Cultural Revolution, although it remains unclear which major decisions were made by Mao Zedong and carried out by the Gang, and which were the result of the Gang of Four's own planning.

The Gang of Four, together with disgraced general Lin Biao who died in 1971, were labeled the two major "counter-revolutionary forces" of the Cultural Revolution and officially blamed by the Chinese government for the worst excesses of the societal chaos that ensued during the ten years of turmoil. Their downfall on October 6, 1976, a mere month after Mao's death, brought about major celebrations on the streets of Beijing and marked the end of a turbulent political era in China.

Their fall did not amount to a rejection of the Cultural Revolution as such. It was organized by the new leader, Premier Hua Guofeng, and others who had risen during that period. Repudiation of the entire process came later, with the return of Deng Xiaoping and Hua's gradual loss of authority.

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