二甲胺是一种有机化合物，分子式(CH₃)₂NH。这种仲胺是一种无色易燃气体，具有氨味和鱼腥味。最常见的是二甲胺的40%水溶液。在2005年，大约27万吨二甲胺被生产出来。

二甲胺分子包括一个被两个甲基取代且连有一个氢的氮。二甲胺是一个碱，其对应的季铵盐CH₃-NH₂-CH₃的pK_a为10.73，超过了甲胺（10.64）和三甲胺（9.79）。

二甲胺可以与酸反应得到盐，比如盐酸二甲胺，一种无味的白色固体，熔点171.5 °C。二甲胺可通过甲醇和氨在高温和高压下催化制得：

Dimethylamine is an organic compound with the formula (CH₃)₂NH. This secondary amine is a colorless, flammable gas with an ammonia-like odor. Dimethylamine is commonly encountered commercially as a solution in water at concentrations up to around 40%. In 2005, an estimated 270,000 tons were produced industrially, but it is also found as a natural product.