Sandeep Unnikrishnan, AC (15 March 1977 – 28 November 2008) was an Indian Army officer, who was serving in the 51 Special Action Group of the National Security Guards on deputation. He was killed in action during the November 2008 Mumbai attacks. He was consequently awarded the Ashoka Chakra, India's highest peacetime gallantry award, on 26 January 2009.