Lalmonirhat-1 is a constituency represented in the Jatiya Sangsad (National Parliament) of Bangladesh. Since 13 February 2026, this constituency is represented by Md. Hasan Rajib Prodhan, a member of the Bangladesh Nationalist Party.
The constituency encompasses Hatibandha and Patgram upazilas.
The constituency was created in 1984 from the Rangpur-5 constituency when the former Rangpur District was split into five districts: Nilphamari, Lalmonirhat, Rangpur, Kurigram, and Gaibandha.
In the 2026 general elections, this victory was part of a "clean sweep" by the BNP in Lalmonirhat, where the party won all three parliamentary seats Including Lalmonirhat-1, Lalmonirhat-2, and Lalmonirhat-3, The election marked a significant shift as the BNP had not won these three specific seats since the 1979 General Elections.