The Unduyamo (Andooyomo) were an indigenous Australian people who once lived around the northern shore of Newcastle Bay, Cape York Peninsula Queensland. It has been hypothesized that, among other aspects of their life, they functioned as religious specialists for Torres Strait Islanders, whose mastery of increase rituals attracted the native mariners from the north. Together with the Gudang, who apparently spoke the same language and whose territory ran from Cape York to Fly Point opposite Pabaju, the Unduyamo had strong cultural, kin and trade ties with the Kaurareg, the southwestern islanders centered on Muralag, with whom they enjoyed an alliance that permitted reciprocal residence on each other's territory. All three groups regarded the Yadhaigana and Gumakudin as hostile.