The Border Security Force (BSF) is the primary border guarding force of India. It is one of the six Central Armed Police Forces of the Union of India. It was raised in the wake of the 1965 War on 1 December 1965, "for ensuring the security of the borders of India and for matters connected there with".

It is a Central Armed Police Force charged with guarding India's land border on western front during peacetime and preventing transnational crime. It is a Union Government Agency under the administrative control of Ministry of Home Affairs. The BSF has its own cadre of officers but head, designated as a Director General (DG), since its raising, has been an officer from the Indian Police Service. It also takes officers from IPS on deputation.

The BSF stands as the world's largest border guarding force. The BSF has played major role since the Indo-Pakistani War of 1971, including Operation Blue Star and Operation Black Thunder. It has also handled Counter Insurgency operations in Jammu and Kashmir.