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

Ammonium bicarbonate is produced by combining carbon dioxide and ammonia:

CO2 + NH3 + H2O → (NH4)HCO3

Ammonium bicarbonate is used in the food industry as a raising agent for flat baked goods, such as cookies and crackers, and in China in steamed buns and Chinese almond cookies.

It was commonly used in the home before modern day baking powder was made available.