Naharlagun is a town situated in the foothills of the Himalayas in the Indian state of Arunachal Pradesh.

[citation needed] Surrounded by mountains, Naharlagun is a city which sees annual long monsoon rains.

According to the 2011 census, 43.14% of the population is Hindu, 32.28% Christian, 16.23%  Donyi Polo, 4.80% Muslim and 1.75% Buddhist Languages spoken in Itanagar (2011)[4] According to 2011 census, Nishi was the most spoken language in Naharlagun with 12,414 speakers followed by Bengali at 5,667, Adi at 4,351, Hindi at 3,319, Assamese at 2,250, Apatani at 2,639, Nepali at 1,358 and Bhojpuri at 1,236.

Naharlagun railway station is the first major rail head in the state of Arunachal Pradesh.

The premier train Arunachal AC Superfast Express links Naharlagun with Anand Vihar Terminal at Delhi.