Ujiarpur Assembly constituency is an assembly constituency in Samastipur district in the Indian state of Bihar.

The constituency was formed following the Delimitation Order of 2008.

[1] As per Delimitation of Parliamentary and Assembly constituencies Order, 2008, No.

134 Ujiarpur Assembly constituency is composed of the following: Ujiarpur community development block; Sultanpur Ghataho, Chakbahauddin, Mokhtiyarpur Salkhani, Panr, Pachpaika, Harishankarpur, Kewanta, Nagargama, Pagra, Nawada, Basariya Plgram panchayats and Dalsinghsarai notified area of Dalsinghsarai CD Block.

[2] In the 2015 state assembly elections, Alok Kumar Mehta of RJD won the newly constituted Ujiarpur seat.