In enzymology, benzaldehyde dehydrogenase (NAD+) () is an enzyme that catalyzes the chemical reaction
The three substrates of this enzyme are benzaldehyde, oxidised nicotinamide adenine dinucleotide (NAD<sup>+</sup>), and water. Its products are benzoic acid, reduced NADH, and a proton.
This enzyme belongs to the family of oxidoreductases, specifically those acting on the aldehyde or oxo group of donor with NAD+ or NADP+ as acceptor. The systematic name of this enzyme class is benzaldehyde:NAD+ oxidoreductase. Other names in common use include benzaldehyde (NAD+) dehydrogenase, and benzaldehyde dehydrogenase (NAD+). This enzyme participates in benzoate degradation via hydroxylation and toluene and xylene degradation.