Magnesium permanganate is an inorganic compound with the chemical formula Mg(MnO4)2.

[1] Magnesium permanganate hexahydrate was prepared by E. Mitserlich and H. Aschoff by reacting barium permanganate with magnesium sulfate:[2] It can be obtained by the reaction of magnesium chloride and silver permanganate: The hexahydrate Mg(MnO4)2·6H2O can be crystallized from the solution, which is slightly hygroscopic.

[3] The anhydrous form can be obtained by decomposing the hexahydrate by heating it.

[4] It decomposes at 130 °C with the evolution of oxygen in an autocatalytic decomposition process.

It oxidizes a range of organic compounds and reacts instantly (in some cases with fire) with common solvents such as tetrahydrofuran, ethanol, methanol, t-butanol, acetone and acetic acid.