Rajapur is a municipality in Bardiya District in Lumbini Province of south-western Nepal.

The municipality was established on 18 May 2014 merging the existing Daulatpur, Naya Gaun, Badalpur, Bhimapur, Manpur Tapara and Rajapur village development committees (VDCs).

At the time of the 1991 Nepal census it had a population of 9,545 and had 1,298 houses in the town.

[3] At the time of the 2011 Nepal census, Rajapur Municipality had a population of 59,818.

[4] In terms of ethnicity/caste, 78.6% were Tharu, 5.6% Hill Brahmin, 4.2% Chhetri, 2.9% Kami, 1.5% Thakuri, 1.4% Musalman, 1.2% Damai/Dholi, 1.2% Magar, 0.5% Yadav, 0.4% Gurung, 0.4% Sanyasi/Dasnami, 0.3% Badi, 0.3% Lohar, 0.3% Newar, 0.3% Sarki, 0.2% Hajjam/Thakur, 0.1% Halwai, 0.1% Kalwar, 0.1% Kewat, 0.1% Kurmi, 0.1% other Terai and 0.1% others.