四氯乙烯，又称全氯乙烯，是一种有机化学品，被广泛用于干洗和金属除油，也被用来制造其他化学品和消费品。

室温下是不易燃的液体。容易挥发，有刺激的甜味。很多人在空气含有百万分之一四氯乙烯的时候就可以闻到。

1821年麦可·法拉第第一次加热六氯乙烷使之分解为四氯乙烯和氯气。

Tetrachloroethylene, also known under the systematic name tetrachloroethene, or perchloroethylene ("perc" or "PERC"), and many other names, is a chlorocarbon with the formula Cl₂C=CCl₂. It is a colorless liquid widely used for dry cleaning of fabrics, hence it is sometimes called "dry-cleaning fluid." It has a sweet odor detectable by most people at a concentration of 1 part per million (1 ppm). Worldwide production was about one million metric tons in 1985.