The present study tries to trace the historical roots of the Bharatiya Janata Party – the principal political vehicle to espouse the Hindu nationalist feelings. The study deals in detail about the concept and growth of Hindu Nationalism. The alignment of Hindu Nationalism with politics in the form of Hindu Mahasabha. The foundation of the Hindu Mahasabha by V.D. Savarkar has been discussed. A thorough and gripping account of the strengthening and the organizational development, separation from Congress and decline of Hindu Mahasabha after independence has been presented.