Dehradun district is a district in Garhwal which is a part of Uttarakhand state in northern India. The district headquarters is Dehradun, which has also served as the interim capital of Uttarakhand since its founding in 2000. The district has 6 tehsils, 6 community development blocks, 17 towns and 764 inhabited villages, and 18 unpopulated villages. As of 2011, it is the second most populous district of Uttarakhand, after Haridwar. Dehradun district also includes the prominent towns of Rishikesh, Mussoorie, Landour and Chakrata. The district stretches from the Ganges river in the east to the Yamuna river in the west, and from the Terai and Shivaliks in the south and southeast to the Great Himalaya in the northwest. During the days of British Raj, the official name of the district was Dehra Dun. In 1842, Dun was attached to Saharanpur district and placed under an officer subordinate to the Collector of the district but since 1871 it is being administered as separate district.

Garhwal is one of the two administrative divisions of the Indian state of Uttarakhand. Lying in the Himalayas, it is bounded on the north by Tibet, on the east by Kumaon, on the south by Uttar Pradesh state, and on the northwest by Himachal Pradesh state. It includes the districts of Chamoli, Dehradun, Haridwar, Pauri Garhwal, Rudraprayag, Tehri Garhwal, and Uttarkashi. The people of Garhwal are known as Garhwali and speak the Garhwali language. The administrative center for Garhwal division is the town of Pauri. The Divisional Commissioner is the administrative head of the Division, and is a senior Indian Administrative Service officer. As the administrative head of the division, the Commissioner is overall incharge of the 7 districts in the Garhwal region of Uttarakhand, and is aided in his duties by an additional commissioner and the district magistrates. Sushil Kumar is the divisional commissioner of the Garhwal Division since December 2021.