Sunsari 3 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 3 incorporates Gadhi Rural Municipality, Barju Rural Municipality, Duhabi Municipality, ward 7 of Inaruwa Municipality and wards 6–15 of Itahari Sub-metropolitan City.

It encompasses the following Province No.

1 Provincial Assembly segment