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

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

[1] Tanahun 1 incorporates Devghat Rural Municipality, Anbukhaireni Rural Municipality, Bandipur Rural Municipality, Bhanu Municipality and, wards 1–4 and 7–11 of Byas Municipality.

It encompasses the following Gandaki Provincial Assembly segment