The Vice Chief of the Air Staff (VCAS) is the deputy to the Chief of the Air Staff of India and second-highest ranking officer of the Indian Air Force. The VCAS is a PSO at Air Headquarters at New Delhi. In the event that the Chief of Air Staff (CAS) is absent or is unable to perform his duties, the VCAS assumes the duties and responsibilities of the CAS. The VCAS is normally held by an officer of three star rank and is held by an air officer of the rank of Air Marshal.

The Chief of the Air Staff (CAS) is a statutory office held by the professional head of the Indian Air Force (IAF), the aerial branch of the Indian Armed Forces. Customarily held by a four-star air chief marshal, the CAS is the senior-most operational officer of the IAF, mandated with the responsibilities of supervising the force's overall functioning during states of peace and wartime, committing to the establishment-cum-continuity of air deterrence and executing India's security objectives vis-à-vis the preservation of the country's air sovereignty. Also a permanent member of the Chiefs of Staff Committee (COSC) and the National Security Council (NSC), the CAS also bears the responsibility of advising the nation's civilian leadership i.e., the Government of India on all matters privy to the IAF.