高锰酸钠，化学式NaMnO₄。

高锰酸钠是一种红紫色晶体或粉末，不易得到无水物。易溶于水、乙醇和乙醚，溶于液氨。氧化性较强。易潮解，因此应用不如高锰酸钾广泛。在碱中以及加热至170°C以上时分解。

2NaMnO₄—Δ→Na₂MnO₄+MnO₂+O₂↑

Sodium permanganate is the inorganic compound with the formula NaMnO₄. It is closely related to the more commonly encountered potassium permanganate, but it is generally less desirable, because it is more expensive to produce. It is mainly available as the monohydrate. This salt absorbs water from the atmosphere and has a low melting point. Being about 15 times more soluble than KMnO₄, sodium permanganate finds some applications where very high concentrations of MnO₄ are sought.