草酸铵是草酸的铵盐，分子式为(NH₄)₂C₂O₄。

无色晶体，带有一分子结晶水，分子式亦可作为(NH₄)₂C₂O₄．H₂O。 遇热会分解成草酸并放出氨气，反应式如下： (NH₄)₂C₂O₄ + 热 → H₂C₂O₄ + 2NH₃↑

Ammonium oxalate, C₂H₈N₂O₄ - sometimes written as (NH₄)₂C₂O₄ - is an oxalate salt with ammonium (sometimes as a monohydrate). It is a colorless salt under standard conditions and is odorless and non-volatile. It is a constituent of some types of kidney stone. Found also in guano.