The Three-anti Campaign (1951) and Five-anti Campaign (1952) (三反五反) were reform movements originally issued by Mao Zedong a few years after the founding of the People's Republic of China in an effort to rid Chinese cities of corruption and enemies of the state. The result turned into a series of campaigns that consolidated Mao's power base by targeting political opponents and capitalists, especially wealthy capitalists.

The Three Antis and Five Antis are: anti-corruption, anti-waste, and anti-bureaucratism; anti-bribery, anti-tax evasion, anti-cost reduction through quality reduction; anti-theft of state property, and anti-espionage of state economic intelligence (the last five primarily targeted against private businesses).