Malate dehydrogenase is an enzyme that reversibly catalyzes the oxidation of malate to oxaloacetate using the reduction of NAD+ to NADH.

Malate dehydrogenase may also refer to:

Malate dehydrogenase (decarboxylating) or NAD-malic enzyme Malate dehydrogenase (NADP+) Malate dehydrogenase (NAD(P)+) Malate dehydrogenase (oxaloacetate-decarboxylating), another NAD-malic enzyme Malate dehydrogenase (oxaloacetate-decarboxylating) (NADP+) or NADP-malic enzyme Malate dehydrogenase (quinone)

See also D-malate dehydrogenase (decarboxylating) Malate dehydrogenase 2