Dullu (Nepali: दुल्लु) is an urban Municipality in Dailekh District of Karnali Province in Nepal.

At the time of the 2011 Nepal census former Dullu had a population of 30,457 people living in 5,861 individual households.

[1] After the reconstruction of local level authority in Nepal in 2017, the total area of the new Dullu municipality has 156.77 square kilometres (60.53 sq mi) and total population is now (as of 2011 Nepal census) 41,540.

[2] The Municipality was formed merging 6 former Village Development Committee i.e. Naule Katuwal, Nepa, Paduka, Dullu, Pusakot Chiudi and Badalamji since 18 May 2014.

[6] In terms of ethnicity/caste, 45.7% were Chhetri, 16.7% Kami, 9.8% Thakuri, 8.8% Hill Brahmin, 6.7% Sarki, 5.0% Damai/Dholi, 4.1% Sanyasi/Dasnami, 1.2% Magar, 0.5% Kumal, 0.4% Gurung, 0.3% Badi, 0.3% other Dalit, 0.2% Majhi, 0.1% Newar, 0.1% other Terai and 0.1% others.