Ammonium malate refers to organic compounds containing malate and ammonium. Two stoichiometries are discussed: NH<sub>4</sub>H(C<sub>2</sub>H<sub>3</sub>OH(CO<sub>2</sub>)<sub>2</sub>) with one ammonium ion per formula unit, and (NH<sub>4</sub>)<sub>2</sub>(C<sub>2</sub>H<sub>3</sub>OH(CO<sub>2</sub>)<sub>2</sub>). Malate, the conjugate base of malic acid, is chiral. Consequently a variety of salts are possible, R vs S vs racemic. The monoammonium salt has been crystallized as the monohydrate.
As a food additive, diammonium malate has been used as flavoring agent and as an acidity regulator. It has the E number E349.