58-year-old Joshi succeeds Admiral Nirmal Verma who retires on 31 August.
Joshi, who was the Western naval commander, has taken over the force at a time when it is set to operate two aircraft carriers and induct a large number of warships, long-range surveillance aircraft and submarines. He will have a three-year tenure.
He has commanded the tri-services Andaman and Nicobar Island Command and also headed the Integrated Defence Staff Headquarters here. He also commanded the Vizag-based Eastern Fleet.
Commissioned in 1974, he has commanded aircraft carrier INS Viraat, guided-missile destroyer Ranvir and corvette INS Kuthar. He has been awarded Nausena Medal,Vishist Seva Medal and Yudh Seva Medal respectively. He subsequently commanded the Eastern Fleet, wherein he was awarded Ati Vishist Seva Medal (AVSM).
A graduate of the Naval War College, USA, he is an alumnus of the College of Naval Warfare, Mumbai and National Defence College here.
He is married to Chitra Joshi and the couple have two daughters.