Papilio oxynius, the Cuban black swallowtail, is a species of Neotropical swallowtail butterfly from the genus Papilio that is found in Cuba.
Similar to P. pelaus but the band of the forewing only indicated; the marginal spots of both wings large.
Larvae feed on Xanthoxylum. Adults are gregarious by day, resting on the trunk and branches.
Papilio oxynius is a member of the anchisiades species group.