Jhunjhunu is a city in the state of Rajasthan in northern India and the administrative headquarters of Jhunjhunu District. Rajasthani and Hindi are widely spoken in Jhunjhunu. Jhunjhunu has given the highest number of soldiers to the Indian army and the paramilitary.

Rani Sati Temple is a temple located in Jhunjhunu, Jhunjhunu district, in the state of Rajasthan, India. It is the largest temple in India devoted to Rani Sati, a Rajasthani lady who lived sometime between the 13th and the 17th century and committed sati (self-immolation) on her husband's death. Various temples in Rajasthan and elsewhere are devoted to her worship and to commemorate her act. Rani Sati is also called Narayani Devi and referred to as Dadiji (grandmother).