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

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

[1] Ilam 1 incorporates Sandakpur Rural Municipality, Maijogmai Rural Municipality, Rong Rural Municipality, Suryodaya Municipality, wards 10, 13 and 14 of Ilam Municipality and wards 1–5, 9 and, 10 of Mai Municipality.

It encompasses the following Koshi Provincial Assembly segment