Bhatnagar (भटनागर) is a common surname used mostly in northern India among the Kayastha caste of Hindus.
People with this surname include:
Shanti Swarup Bhatnagar (1894-1955), Indian scientistPrabhu Lal Bhatnagar (1912 – 1976), Indian mathematician known for Bhatnagar–Gross–Krook operatorV. K. Bhatnagar, founder of Manav Sthali School and Bhatnagar International SchoolShivani Bhatnagar (died 1999), Indian Express journalistRam Ratan Bhatnagar, Hindi scholar and professor at University of SagarArvind Bhatnagar (1936-2006), Indian astronomer; founder-director of the Udaipur Solar Observatory and the Nehru Planetarium of BombayDeepti Bhatnagar, Indian model and actress