Nyctemera formosana is a species of moth in the family Erebidae. It was first described as Deilemera formosana by Charles Swinhoe in 1908. In modern sources, it is variously treated as a valid species, or more often, as a subspecies Nyctemera carissima formosana or Nyctemera muelleri formosana. It is found in Taiwan and the Ryukyu Islands of Japan (Iriomote Island).