The leaf muntjac, leaf deer or Putao muntjac (Muntiacus putaoensis) is a small species of muntjac. It was discovered in 1997 by biologist Alan Rabinowitz during his field study in the isolated Naungmung Township in Myanmar.

Rabinowitz discovered the species by examining the small carcass of a deer that he initially believed was the juvenile of another species; however, it proved to be the carcass of an adult female.

He managed to obtain specimens, from which DNA analysis revealed a new cervid species. Local hunters knew of the species and called it the leaf deer because its body could be completely wrapped by a single large leaf.