Sunsari 1 is one of four parliamentary constituencies of Sunsari District in Nepal.

This constituency came into existence on the Constituency Delimitation Commission (CDC) report submitted on 31 August 2017.

[1]Sunsari 1 incorporates Dharan Sub-metropolitan City, wards 1–5 of Barah Municipality and wards 6 and 7 of Ramdhuni Municipality It encompasses the following Province No.

1 Provincial Assembly segment