Ada Elizabeth Deer was an American scholar and civil servant who was a member of the Menominee Indian Tribe of Wisconsin and a Native American advocate. As an activist she opposed the federal termination of tribes from the 1950s. During the Clinton administration, Deer served as Assistant Secretary of the Interior for Indian Affairs. Due to all of her advocacy and organization on behalf of Native people, she was recognized as a social work pioneer by the National Associate of Social Workers in 2010.