甲醛缩二甲醇，简称甲缩醛，结构式CH₂(OCH₃)₂。

无色、澄清、易挥发、有氯仿气味和刺激气味液体。溶于约3倍的水，与多数有机溶剂混溶。可燃。毒性不大，但可引起肾、肺衰竭。

受端基异构效应影响，甲缩醛分子主要采取邻交叉（Gauche）构象而非反叠（anti）构象。

Dimethoxymethane, also called methylal, is a colorless flammable liquid with a low boiling point, low viscosity and excellent dissolving power. It has a chloroform-like odor and a pungent taste. It is the dimethyl acetal of formaldehyde. Dimethoxymethane is soluble in three parts water and miscible with most common organic solvents.