The Persian onager (Equus hemionus onager), also called the gur, is a subspecies of onager (Asiatic wild ass) native to Iran.
It is "critically endangered" and "extremely rare", with no more than 600 individuals left in the wild and only 30 individuals living within North American institutions. Currently, poaching for meat and hide, competition with livestock, and drought are the greatest threats to this species. Sometimes the term "onager" is reserved specifically for this subspecies. Information on the basic biology of the subspecies and how it differs from others is lacking, which hampers conservation efforts.