Nitrate reductase (NADPH) (, assimilatory nitrate reductase, assimilatory reduced nicotinamide adenine dinucleotide phosphate-nitrate reductase, NADPH-nitrate reductase, assimilatory NADPH-nitrate reductase, triphosphopyridine nucleotide-nitrate reductase, NADPH:nitrate reductase, nitrate reductase (NADPH<sub>2</sub>), NADPH<sub>2</sub>:nitrate oxidoreductase) is an enzyme with systematic name nitrite:NADP<sup>+</sup> oxidoreductase. This enzyme catalises the following chemical reaction
Nitrate reductase is an iron-sulfur molybdenum flavoprotein.