Krishnaswamy Subrahmanyam (19 January 1929 – 2 February 2011) was a prominent international strategic affairs analyst, journalist and former Indian civil servant. Considered a proponent of Realpolitik, Subrahmanyam was an influential voice in Indian security affairs for a long time. He was most often referred to as the doyen of India's strategic affairs community, and as the premier ideological champion of India's nuclear deterrent. His son S Jaishankar was appointed India's External Affairs Minister in 2019.