Dichloromethyl methyl ether (HCl<sub>2</sub>COCH<sub>3</sub>) is an organic compound that belongs to the class of ethers with a dichloromethyl group and a methyl group. It can be synthesized from methyl formate and a mixture of phosphorus pentachloride and phosphorus oxychloride or by chlorination of chlorodimethyl ether.
The compound is used in the formylation of aromatic compounds (Rieche formylation) and as a chlorination agent in the formation of acid chlorides.