Hazaribagh district (Hindi: हज़ारीबाग़ ज़िला) is one of the twenty-four districts of Jharkhand state, India, and Hazaribagh town is the district headquarters. It is currently a part of the Red Corridor.

The district is named after its headquarters, the town of Hazaribagh. The name, Hazaribagh consists of two urdu words, hazar meaning "one thousand", and bagh meaning "garden" - so, the literal meaning of Hazaribagh is 'a city of one thousand gardens'.

In 1976 Giridih district was split from Hazaribagh. In 1999 this happened again with the creation of Chatra and Koderma. Hazaribagh left Bihar when Jharkhand was formed on 15 November 2000. On 12 September 2007, yet another district was created with Hazaribagh's territory: Ramgarh.

Mica and coal are the major minerals found in this district. This significant coal deposit reserves of this district include Charhi, Kuju Ghato Tand and Barkagaon or North Karnpura. the coal mines are the main source of livelihood for the residents of this district. People of this district are known to be very hard working.

Hazaribagh (Hindi: हज़ारीबाग़) is a city and a municipality in Hazaribagh district in the Indian state of Jharkhand. It is the divisional headquarters of North Chotanagpur division. It is famous as a health resort and for Hazaribagh National Park (17 km from city).

Etymologially, the word 'Hazaribagh' is made of two Persian words. Hazar means one thousand (1,000) and Bagh means garden (as is found in the name of Iraq's capital "Baghdad"). Hence the literal meaning of Hazaribagh is 'city of a thousand gardens'. According to Sir John Houlton the town takes its name from the small villages of Okni and Hazari – shown in old maps as Ocunhazry. The last syllable in its name probably originated in a mango-grove, which formed a camping ground for troops and travellers marching along the ‘new military road’ from Kolkata to Varanasi, constructed in 1782 and the following years. The Grand Trunk Road subsequently replaced this military road in the mid-eight hundreds, but the lay out differed at places, particularly around Hazaribagh. A dilapidated watch tower meant to guard the military road is still visible on Tower Hill, near Silwar.