Nalanda district is one of the thirty-eight districts of the state of Bihar in India. Bihar Sharif is the administrative headquarters of this district. The districts contain the ancient Nalanda Mahavihara a UNESCO World Heritage Site. Nalanda is located in the Magadh region of southern Bihar.
Nalanda became a fully-fledged district when it was split from Patna on 9 November 1972.
Nalanda district occupies an area of . The Phalgu, Mohane, Jirayan, and Kumbhari rivers flow through it. The district is a part of Patna Division. Majority of the land in the district is fertile land of Indo Gangetic plane. In the extreme South, there lies the hills of Rajgir. There is also one small hillock in the district headquarters of Bihar Sharif.
In 1978 Nalanda district became home to the Pant Wildlife Sanctuary, Rajgir which has an area of .
According to the 2011 census Nalanda district has a population of 2,877,653, roughly equal to the nation of Mongolia or the US state of Kansas. This gives it a ranking of 134th in India (out of a total of 640), and 18th in state. The district has a population density of . Its population growth rate over the decade 2001-2011 was 21.18%. Nalanda has a sex ratio of 921 females for every 1000 males, and a literacy rate of 66.41%. 15.91% of the population lives in urban areas. Scheduled Castes and Scheduled Tribes make up 21.12% and 0.05% of the population respectively.
At the time of the 2011 Census of India, 56.27% of the population in the district spoke Magahi, 37.28% Hindi and 5.69% Urdu as their first language.
Since Kurmis are dominant in Nalanda, it is also known by the name Kurmistan in political circle. Nalanda district is the birthplace of Chief Minister of Bihar, Nitish Kumar. The Nalanda district comprises Nalanda Lok Sabha constituency, which can further be fragmented into seven Legislative Assembly constituencies. In 2015 Bihar Assembly elections, Janata Dal (United) (JDU), the political party led by Kumar was able to win five out of seven Legislative Assembly constituencies of the district.