Saptari 1 is one of four parliamentary constituencies of Saptari District in Nepal. This constituency came into existence on the Constituency Delimitation Commission (CDC) report submitted on 31 August 2017.In 2026, Pushpa Kumari Chaudhary of Rastriya Swatantra Party won the parliamentary election from this constituency.
Saptari 1 incorporates Saptakoshi Rural Municipality, Agnisair Krishna Savaran Rural Municipality, Tirhut Rural Municipality, Kanchanrup Municipality and Hanumannagar Kanalini Municipality.
It encompasses the following Provincial Assembly of Madhesh Province segment