The Bemba language - is a Bantu language spoken primarily in north-eastern Zambia by the Bemba people and as a lingua franca by about 18 related ethnic groups, including the Bisa people of Mpika and Lake Bangweulu, and to a lesser extent in Katanga in the Democratic Republic of the Congo and Tanzania. Including all its dialects, Bemba is the most spoken indigenous Bantu language and a lingua franca in Zambia where the Bemba form the largest ethnic group.

More information: Wikipedia

Native speakers:  4.1 million (2000–2010 census)

Recognised minority language in: Zambia