Nitrate reductase (NADH) (, assimilatory nitrate reductase, NADH-nitrate reductase, NADH-dependent nitrate reductase, assimilatory NADH: nitrate reductase, nitrate reductase (NADH<sub>2</sub>), NADH<sub>2</sub>: nitrate oxidoreductase) is an enzyme with systematic name nitrite: NAD<sup>+</sup> oxidoreductase. This enzyme catalyzes the following chemical reaction
Nitrate reductase is an iron-sulfur molybdenum flavoprotein.