Troides oblongomaculatus, the oblong-spotted birdwing, is a birdwing butterfly found in Indonesia and New Guinea. T. oblongomaculatus is the only Troides species found as far east as New Guinea. It has been assumed that the species originated in the Moluccas and later penetrated into Melanesia. It is a common species, the larva of which feed on Aristolochia tagala.