Achham 1 is one of two parliamentary constituencies of Achham District in Nepal.

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

[1] Achham 1 incorporates Sanphebagar Municipality, Mellekh Rural Municipality, Chaurpati Rural Municipality, Bannigadhi Jayagadh Rural Municipality and Ramaroshan Rural Municipality.

It encompasses the following Sudurpashchim Provincial Assembly segment