Protantigius is a monotypic butterfly genus in the family Lycaenidae. Its single species is Protantigius superans found in the Russian Far East (Primorye), north-eastern and central China and on the Korean Peninsula.
The habitat consists of gaps, stream bottomlands and edges of deciduous forests.
Adults are on wing from mid-July to mid-August.
The larvae possibly feed on Fraxinus rhynchophylla, Alunus hirsuta, Populus koreana and/or Salix species.