The Amurdak, people, also written Amarak and Ngamarak, are an indigenous Australian people of the Cobourg Peninsula in the Northern Territory.
See main article: Amurdak language. The language of the Amarak, Amurdak, is now virtually extinct, the last known speaker being Charlie Mungulda. It was also known as Wardadjbak, and belongs to the Iwaidja language family. It had two dialects, Urrik and Didjurra.
The Amurdak's traditional lands extended over some 900mi2 around the eastern coast of Van Diemen Gulf. Their northern extend lay beyond Murgenella Creek and in the vicinity of Cooper Creek, while their southern frontier was close to the East Alligator River.
According to the widespread creation story of the Cobourg Peninsula dreamtime, the Amurdak (Umoriu) descended from Imberombera deposited who children at a place near Cooper Creek known as Mamul. One of the children was called Kominuuru, and, on leaving, she told them to speak Amurdak, and an edible bulb called .