List of butterfly (Papilionoidea) species found in Japan.

If someone with more expertise notices some mistakes, please correct.

These species couldn't be added because they don't exist on iNat currently:
Colias polyographus
Pieris tomariana
Ochlodes asahinai
Celastrina (Celastrina) ladonides
Luthrodes mindora
Phengaris ogumae
Plebejus iburiensis
Plebejus (Lycaeides) pseudaegon
Satyrium mera
Thermozephyrus kirishimaensis
Polyura narcaeus
Argynnis asahidakeana
Argynnis (Fabriciana) coreana
Nymphalis (Roddia) vaualbum
Parnassius (Driopa) felderi