高氯酸铵，或称过氯酸铵，是一种白色的晶体，分子式为 NH₄ClO₄，有潮解性。它通常可以用来制造炸药、烟火，由于分解产生大量气体，过去也用作火箭燃料，并用作分析试剂。

高氯酸铵常见有两种制备方式，一是利用氨水和高氯酸的酸碱中和反应，二是利用铵盐和高氯酸钠的复分解反应：

NH₃·H₂O + HClO₄ → NH₄ClO₄ + H₂O

NH₄Cl + NaClO₄ → NH₄ClO₄ + NaCl

在这个反应中，溶解度较小的高氯酸铵会首先析出。

Ammonium perchlorate is an inorganic compound with the formula NH₄ClO₄. It is the salt of perchloric acid and ammonia. It is a powerful oxidizer, which explains its main use in solid propellants, such as rockets and missiles. It has been involved in a number of accidents, such as the PEPCON disaster.