In enzymology, a cyanuric acid amidohydrolase () is an enzyme that catalyzes the chemical reaction
Thus, the two substrates of this enzyme are cyanuric acid and H<sub>2</sub>O, whereas its two products are biuret and CO<sub>2</sub>.
This enzyme belongs to the family of hydrolases, those acting on carbon-nitrogen bonds other than peptide bonds, specifically in cyclic amides. The systematic name of this enzyme class is cyanuric acid amidohydrolase. This enzyme participates in atrazine degradation.