In enzymology, a D-glutamate(D-aspartate) oxidase (EC 1.4.3.15) is an enzyme that catalyzes the chemical reaction

D-glutamate + H₂O + O₂ ${\displaystyle \rightleftharpoons }$ 2-oxoglutarate + NH₃ + H₂O₂

The 3 substrates of this enzyme are D-glutamate, H₂O, and O₂, whereas its 3 products are 2-oxoglutarate, NH₃, and H₂O₂.

This enzyme belongs to the family of oxidoreductases, specifically those acting on the CH-NH2 group of donors with oxygen as acceptor. The systematic name of this enzyme class is D-glutamate(D-aspartate):oxygen oxidoreductase (deaminating). Other names in common use include D-glutamic-aspartic oxidase, and D-monoaminodicarboxylic acid oxidase. This enzyme participates in alanine and aspartate metabolism. It employs one cofactor, FAD.