Nitrite reductase refers to any of several classes of enzymes that catalyze the reduction of nitrite.

Nitrite reductase may also refer to:

• Nitrite reductase (NO-forming)
• Nitrite reductase (NAD(P)H)

• Cytochrome c nitrite reductase
• Ferredoxin—nitrite reductase
• Nitrate reductase (disambiguation)