Papilio zalmoxis, the giant blue swallowtail, is an African butterfly belonging to the family Papilionidae.

The name of the species is given in honor of Zalmoxis – a divinity of the Getae (a people of the lower Danube), mentioned by Herodotus in his Histories IV, 93–96.

Papilio zalmoxis has a wingspan reaching about 12–16 centimetres (4.7–6.3 in) and it is the second largest African swallowtail.

Uppersides of the hindwings have a black marginal band, with a chain of blue spots.

Papilio zalmoxis is an African butterfly, living in tropical areas (Liberia, Ghana, Cameroon, Nigeria, Gabon, Democratic Republic of the Congo, Zaire, Ivory Coast).