UDP-N-acetyl-D-mannosamine dehydrogenase (, UDP-ManNAc 6-dehydrogenase, wecC (gene)) is an enzyme with systematic name UDP-N-acetyl-alpha-D-mannosamine:NAD<sup>+</sup> 6-oxidoreductase. This enzyme catalyses the following chemical reaction
This enzyme participates in acetamido sugar biosynthesis in bacteria and archaea.