Rewari district is one of the 22 districts in the state of Haryana, India. It was carved out of Gurgaon district by the Government of Haryana on 1 November 1989. It is also part of the National Capital Region. The administrative headquarter of the district is the city of Rewari, which is also the biggest city in the district. In medieval times, it was an important market town. It is located in southern Haryana. As of 2011, it is the second least populous district of Haryana after Panchkula.