Raja Nahar Singh (died 1858) was a great Jat ruler of the princely state of Ballabhgarh in Faridabad District of Haryana, India. They built a fort in Faridabad around 1739.
He was involved in the Indian Rebellion of 1857.
Nahar Singh, the Raja of Ballabgarh was 32 years old when he threw his small army into the fray against the British during the 1857 uprising. Refusing an offer to save himself by acknowledging British supremacy, he was hung in Chandni Chowk on 9 January 1858 and his estate was forfeited. He was charged by the colonial rulers for assisting rebellion with money, provisions and arms and by sending troops to Palwal, for taking it from the British Government in India. British sentenced him to “be hanged by neck until he be dead and further to forfeit all his property and effects of every description.” His state was taken over by the British and thus sun set on the Jat state of Ballabhgarh.