Pharmacophagus antenor, the Madagascar giant swallowtail, is a butterfly from the family Papilionidae.

As the common name implies, it is large (12– to 14-cm wingspan) and endemic to Madagascar.

It is the only species in the genus Pharmacophagus.

The larvae feed on Aristolochia acuminata and Quisqualis grandidieri.

This Papilionidae-related article is a stub.