Lalmonirhat-3 is a constituency represented in the Jatiya Sangsad (National Parliament) of Bangladesh. The current Member of Parliament in this constituency is Asadul Habib Dulu of Bangladesh Nationalist Party.
The constituency encompasses Lalmonirhat Sadar Upazila.
The constituency was created in 1984 from a Rangpur 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.