氯甲醚，结构式ClCH₂OCH₃。

无色、有刺激性臭味、易挥发、催泪性透明液体。遇水分解，溶于乙醇、丙酮、氯仿、苯、乙苯。剧毒，致癌。市售氯甲醚中常含2～8％副产物双(氯甲基)醚，后者致癌性更强。

Chloromethyl methyl ether (CMME) is a compound with formula CH₃OCH₂Cl. It is a chloroalkyl ether. It is used as an alkylating agent and industrial solvent to manufacture dodecylbenzyl chloride, water repellents, ion-exchange resins, polymers, and as a chloromethylation reagent. In organic synthesis, it is used for introducing the methoxymethyl (MOM) protecting group, and is thus often called MOM-Cl or MOM chloride.