高锰酸铵，又称过锰酸铵，是一种紫色固体，斜方晶系，分子式为NH₄MnO₄，可溶于水。高锰酸铵不稳定，在室温下也会缓慢分解。

高锰酸铵通常利用碳酸铵和高锰酸铝的复分解反应来制备：

• 6 KMnO₄ + 4 Al₂(SO₄)₃·18 H₂O + 6 H₂O → 2 Al(MnO₄)₃ + 6 KAl(SO₄)₂·12H₂O
• 2 Al(MnO₄)₃ + 3 (NH₄)₂CO₃ + 3 H₂O → 2 Al(OH)₃ + 3 CO₂↑ + 6 NH₄MnO₄

Ammonium permanganate is the chemical compound NH₄MnO₄, or NH₃·HMnO₄. It is soluble in water. It is a strong oxidizer, owing to its permanganate anion, and it is a moderately strong explosive, owing to the combination of oxidizer permanganate anion and reducing ammonium cation. Dry ammonium permanganate can detonate by heat, shock, or friction, and it may explode at temperatures above 140 °F (60 °C).