Hypobapta percomptaria is a moth of the Geometridae family. It is known from Australia, including South Australia, New South Wales, Queensland, Victoria and Tasmania. The wingspan is about 50 mm. Adults are grey-brown with wavy lines. Specimens from Tasmania are generally paler than mainland specimens. The larvae feed on Eucalyptus species. Young larvae are brown with a red head and tail. Later instars become green with a conical head.