The Directorate General of Security is an organisation of covert operations under India's Cabinet Secretariat. It is one of the four legally defined intelligence organisations of India and listed in the Schedule of the Intelligence Organisations Act, 1985, the other three being I.B., R&AW and NTRO. Since 1971, the Secretary, Research and Analysis Wing has usually held the post of Director General. This organisation used to be composed of Special Service Bureau, Aviation Research Centre, Special Frontier Force and Chief Inspectorate of Armaments. Since the shifting of SSB and CIOA to the Ministry of Home Affairs in 2001, DGS consists of ARC and SFF only. The Special Group, a non-Tibetan and Sarsawa-based unit of SFF, is also a DGS component.

The Aviation Research Centre (ARC) is India's imagery intelligence organisation, a part of the Directorate General of Security, run by the Research and Analysis Wing (R&AW). It started functioning in November 1962, in the wake of the Sino-Indian War, as an extension of the Intelligence Bureau, but placed under the Ministry of External Affairs.