Byasa rhadinus is a species of butterfly from the family Papilionidae. It is found in China.[1]
Originally described as Papilio mencius Felder, 1862 subsp. rhadinus Jordan, 1928, this butterfly was considered conspecific with Atrophaneura mencius (e.g., Collins & Morris 1985, Fujioka et al. 1997). It has been reclassified as a viable species by Chou (1994).