Admiral Radhakrishnan Hari Kumar PVSM, AVSM, VSM, ADC (born 12 April 1962) is retired flag officer in the Indian Navy.

[9][10][11] He joined the 61st course of the National Defence Academy (NDA) in January 1979 and was assigned to the Juliet squadron.

[7][8] He was awarded the Vishisht Seva Medal for his command of the Ranvir when the mid-life upgrade was completed in which the ship was retrofitted with the BrahMos supersonic cruise missiles.

On promotion to flag rank, Kumar was appointed the first Commandant of the Naval War College, Goa in January 2012.

While serving as the Flag Officer Commanding Western Fleet (FOCWF), he was promoted to the rank of Vice Admiral.

[13][14][15] In October 2015, he relinquished command of the Western Fleet, handing over to Rear Admiral Ravneet Singh.

[17] On 1 August 2018, he assumed charge as the Chief of Personnel (COP), succeeding Vice Admiral Anil Kumar Chawla.

[8] After an 18-month tenure as COP, Kumar was promoted to Commander-in-Chief (C-in-C) grade and appointed Chief of Integrated Defence Staff (CISC).

He took office after superannuation of Admiral Karambir Singh on 30 November 2021 and served there till 30 April 2024.