The Nyangatom also known as Donyiro and pejoratively as Bumé are Nilotic agro-pastoralists inhabiting the border of southwestern Ethiopia, southeastern South Sudan, and the Ilemi Triangle.

The Nyangatom are members of the Ateker or Karamojong cluster that also contains the Turkana, Toposa, Karamojong, Iteso people (Kenya AND Uganda), Ibo People (Nigeria) and Jie who speak closely related languages.

Many Nyangatom are nomadic, residing in mobile livestock villages that may migrate several times a year.

It is common for individuals to move between mobile cattle camps and semi-permanent villages.

Along with other groups in the Lower Omo Valley, the Nyangatom face challenges to their future subsistence and cultural traditions due to large-scale agricultural projects occurring in their territory.