Troides aeacus, the golden birdwing, is a large tropical butterfly belonging to the swallowtail family, Papilionidae.

In the female the differences from cerebrus are: Forewing: the pale adnervular streaks very broad, very prominent and extended well into the cell.

Hindwing: the basal third of the cell and of interspace 2 black, the middle portion of the latter yellow anteriorly, buffy-white posteriorly; the posterior half of the discal area between the postdiscal spots themselves and between them and the terminal cone-shaped markings more or less irrorated with blackish scales; lastly, the black in interspace 7 interrupted by an inner triangular and an outer small yellow spot.

[4] It is found in northern India, Bangladesh, Nepal, Bhutan, Burma, China, Thailand, Laos, Vietnam, Cambodia, peninsular Malaysia, and Taiwan.

Although it is classified as a species of Least Concern by the IUCN Red List, it may require protection in peninsular Malaya.