碳酸氢铵（Ammonium bicarbonate）是氨的碳酸盐，分子式为NH₄HCO₃。

二氧化碳通入碳酸铵溶液中也可得到碳酸氢铵。它是白色粉末，带有类似氨水的刺鼻味道，在水中溶解度不大。碳酸氢铵溶液放置在空气中或加热时会放出二氧化碳，溶液也变为碱性。水溶液中的所有碳酸盐在加热煮沸时产生分解，释放二氧化碳和与碳酸离子反应形成碳酸氢盐的物质，如下反应式所示：

Ammonium bicarbonate is an inorganic compound with formula (NH₄)HCO₃, simplified to NH₅CO₃. The compound has many names, reflecting its long history. Chemically speaking, it is the bicarbonate salt of the ammonium ion. It is a colourless solid that degrades readily to carbon dioxide, water and ammonia.