Graphium cyrnus is a butterfly in the family Papilionidae.
The top of the wings consist of black with many greenish-yellow dots, with the underside being roughly the same but instead of black, it is a reddish-brown.
It is found on Madagascar. The habitat consists of subhumid forests.
It is a member of the leonidas-group of closely species (Graphium leonidas, Graphium levassori, Graphium cyrnus).