Chester Arthur Crocker is an American diplomat and scholar who served as Assistant Secretary of State for African Affairs from June 9, 1981, to April 21, 1989, in the Reagan administration. Crocker, architect of the U.S. policy of "constructive engagement" towards Southern Africa including apartheid-era South Africa, is credited with setting the terms of Namibian independence.

The Assistant Secretary for the Bureau of African Affairs is the head of the Bureau of African Affairs, within the United States Department of State, who guides operation of the U.S. diplomatic establishment in the countries of sub-Saharan Africa and advises the Secretary of State and the Under Secretary for Political Affairs.