Protesilaus protesilaus is a species of butterfly of the family Papilionidae. It is found in the Neotropical realm.
Bands one and two of the hindwing usually extend beyond the second submedian, band four mostly goes beyond the middle of the cell and sometimes reaches to its hinder margin, the transparent submarginal band has at least in the costal third brownish scales; hindwing more strongly dentate than in Protesilaus glaucolaus leucas. Frons in specimens from the Andes often entirely brownish black. Dorsal edge of the harpe dilated into a tooth, which is sometimes absent in specimens from the Andes. Submarginal spots of the hindwing white, rarely slightly yellowish, hindwing more strongly dentate than in Protesilaus glaucolaus, the first and second bands of the forewing on the whole shorter than in Protesilaus molops. Frons sometimes entirety brown black. The scent-scales very long and thin. The dorsal edge of the harpe deflexed, lying flat on the harpe, strongly dentate.
