Nawalparasi (Bardaghat Susta West) 1 is one of two parliamentary constituencies of Nawalparasi (West of Bardaghat Susta) district in Nepal.

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

[1] Nawalparasi (Bardaghat Susta West) 1 incorporates Bardaghat Municipality, Susta Rural Municipality, Pratappur Rural Municipality and wards 4, 5, 6 and 7 of Sarawal Rural Municipality.

It encompasses the following Lumbini Provincial Assembly segment