氯乙烷或一氯乙烷，是一种无色可燃气体，分子式为C₂H₅Cl，缩写为EtCl。

氯乙烷可由乙烯和氯化氢在氧化铝催化剂和130～250℃条件下反应制得：

C₂H₄ + HCl → C₂H₅Cl

此外还可以用乙醇和盐酸或者乙烷和氯气进行反应来制取氯乙烷。但这些方法都不够经济。

Chloroethane or monochloroethane, commonly known by its old name ethyl chloride, is a chemical compound with chemical formula C
2H
5Cl, once widely used in producing tetraethyllead, a gasoline additive. It is a colorless, flammable gas or refrigerated liquid with a faintly sweet odor.