In enzymology, a L-arabinose 1-dehydrogenase () is an enzyme that catalyzes the chemical reaction
The two substrates of this enzyme are L-arabinose and oxidised nicotinamide adenine dinucleotide (NAD<sup>+</sup>). Its products are L-arabino-1,4-lactone, 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<sup>+</sup> or NADP<sup>+</sup> as acceptor. The systematic name of this enzyme class is L-arabinose:NAD<sup>+</sup> 1-oxidoreductase. This enzyme participates in ascorbate and aldarate metabolism.