N,N-二甲基乙酰胺（化学式：CH₃C(O)N(CH₃)₂），简称二甲基乙酰胺，缩写DMAC。

无色液体，与水混溶。沸点较高。与其他多数溶剂混溶，但在脂肪烃类溶剂中溶解性不佳。

Dimethylacetamide (DMA) is the organic compound with the formula CH₃C(O)N(CH₃)₂. This colorless, water-miscible, high boiling liquid is commonly used as a polar solvent in organic synthesis. DMA is miscible with most other solvents, although it is poorly soluble in aliphatic hydrocarbons.