Glycerol dehydrogenase (EC1.1.1.6, also known as NAD-linked glycerol dehydrogenase, glycerol: NAD 2-oxidoreductase, GDH, GlDH, GlyDH) is an enzyme in the oxidoreductase family that utilizes the NAD to catalyze the oxidation of glycerol to form glycerone (dihydroxyacetone).