二酸化망간(manganese dioxide) 또는 酸化망간(IV)(IV), manganese(IV) oxide)는, 化學式이 MnO2라고 나타내지는 망간의 酸化物이다. 酸化劑乾電池, 無機觸媒로서 利用되고 있다. 「二酸化망간」이라고 一般的으로는 불리지만, 實際로는 不定比化合物이다.

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