The chief of staff of the Air Force (acronym: CSAF, or AF/CC) is a statutory office () held by a general in the United States Air Force, and as such is the principal military advisor to the secretary of the Air Force on matter pertaining to the Air Force; and is in a separate capacity (), a member of the Joint Chiefs of Staff, and thereby a military adviser to the National Security Council, the secretary of defense, and the President. The chief of staff is typically the highest-ranking officer on active duty in the Air Force unless the chairman and/or the vice chairman of the Joint Chiefs of Staff are Air Force officers.
The chief of staff of the Air Force is an administrative position based in the Pentagon, and while the chief of staff does not have operational command authority over Air Force forces (that is within the purview of the combatant commanders who report to the secretary of defense), the chief of staff does exercise supervision of Air Force units and organizations as the designee of the secretary of the Air Force.
The current chief of staff of the Air Force is General Charles Q. Brown Jr.
Under the authority, direction and control of the secretary of the Air Force, the chief of staff presides over the Air Staff, acts as the Secretary's executive agent in carrying out approved plans, and exercises supervision, consistent with authority assigned to the commanders of the Unified Combatant Commands, over organizations and members of the Air Force as determined by the Secretary. The chief of staff may also perform other duties as assigned by either the president, the secretary of defense or the secretary of the Air Force.
The vice chief of staff of the Air Force, also a four-star general, is the chief of staff's principal deputy.
The chief of staff of the Air Force is a member of the Joint Chiefs of Staff as prescribed by . When performing his JCS duties the chief of staff is responsible directly to the secretary of defense.