Pilar M. Thomas is an American lawyer and a member of the Pascua Yaqui Tribe of Arizona, for which she has served as attorney. She has worked on water rights, treaty rights, gaming law, and coordinated federal agency policies and efforts in tribal energy development. In addition to working in the U.S. Departments of Justice and Energy, she has served as the Deputy Solicitor of Indian Affairs for the U.S. Department of the Interior. Thomas participated in negotiations for the U.S. adoption of the United Nations’ Declaration on the Rights of Indigenous People, and the Department of Interior’s tribal lands leasing reform.