In enzymology, mannitol dehydrogenase () is an enzyme that catalyzes the chemical reaction
The two substrates of this enzyme are D-mannitol and oxidised nicotinamide adenine dinucleotide (NAD+). Its products are D-mannose, reduced NADH and a proton.
This enzyme belongs to the family of oxidoreductases, specifically those acting on the CH-OH group of donor with NAD+ or NADP+ as acceptor. The systematic name of this enzyme class is mannitol:NAD+ 1-oxidoreductase. Other names in common use include MTD, and NAD+-dependent mannitol dehydrogenase.
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