Belgaum a district in the state of Karnataka, India. The city of Belgaum is the district headquarters in North Karnataka. It is also called as the second capital for the state of Karnataka, as it houses the Suvarna Vidhana soudha. According to the 2011 Census of India, it has a population of 4,778,439 of which 24.03% live in urban areas, making it the second most populous district in Karnataka (out of 30), after Bangalore.The district has an area of 13,415 square kilometers, and is bounded on the west and north by Maharashtra state, on the northeast by Bijapur District, on the east by Bagalkote District, on the southeast by Gadaga District, on the south by Dharawad District and Uttara Kannada districts, and on the southwest by the state of Goa.

According to the 2011 census Belgaum district has a population of 4,778,439, roughly equal to the nation of Singapore or the US state of Alabama.This gives it a ranking of 25th in India (out of a total of 640).The district has a population density of 356 inhabitants per square kilometre (920/sq mi).Its population growth rate over the decade 2001-2011 was 13.38%.Belgaum has a sex ratio of 969 females for every 1000 males, and a literacy rate of 73.94%.Kannada is the main language and is spoken by a majority of the population of the district (by 73%) although Marathi is the predominant spoken in the cities of Belgaum, Khanapur, Nipani, Ugar etc. and also in most of the villages in southern part of Belgaum and Khanapur taluka. There is also sizable population of Dakhini (a southern dialect of Urdu) and Konkani speakers in the district. Hindi and English are also spoken, the latter being the medium of instruction at the college and university level as also being the spoken language in most upper class and educated households of Marathi, Kannada and Muslim families. Almost 67% of the residents of Belgaum District are multilingual, conversant in Kannada, Marathi, Urdu-Hindi and to some extent, English.

Visveswaraiah Technological University is located in Belgaum. All technical and engineering colleges in the Karnataka State come under this University. Belgaum is also known for the Airmen Training School, an Indian Air Force training centre located at Sambra. The Maratha Light Infantry has its regimental headquarters in Belgaum. The Commando School and School of jungle warfare and the Indian Army is also situated in Belgaum. The Karnataka Lingayat (K.L.E.) Education Society is in Belgaum. The K.L.E.S. Hospital of Belgaum is the second-largest hospital in Asia. The Medical Council of India has one of its regional research centre here, and the Indian Institute of Hydrology and Vaccine Institute are also situated here. Military School Belgaum is one of the five Military Schools in India. The School was set up in 1945 by King George VI for the wards of VCOs (present day JCOs) and NCOs of the Indian Army. Dr Sudarshan Gadad Young animal geneticist is from this district.