叠氮酸，分子式HN₃，在常温常压下为一种无色、具挥发性、有刺激臭、高爆炸性的液体。

叠氮酸主要用于保存贮存溶液（stock solution），以及作为一种试剂。

Hydrazoic acid, also known as hydrogen azide or azoimide, is a colorless, volatile, and explosive liquid at room temperature and pressure. It is a compound of nitrogen and hydrogen, having chemical formula HN₃. It was first isolated in 1890 by Theodor Curtius. The acid has few applications, but its conjugate base, the azide ion, is useful in specialized processes.