Bihariganj Assembly constituency is an assembly constituency in Madhepura district in the Indian state of Bihar.

Niranjan Kumar Mehta of Janata Dal (United) is the current MLA.

[1] As per Delimitation of Parliamentary and Assembly constituencies Order, 2008, No.

71 Bihariganj Assembly constituency is composed of the following: Bihariganj and Gwalpara community development blocks; Biriranpal, Madhuban, Rampur Khora, Kishunganj, Pararia, Barahi Anadpura and Pipra Karoti gram panchayats of Uda Kishunganj CD Block; Gram Panchayats Haripur Kala, Digghi, Singiyon, Raghunathpur, Kolhaypatti Dumriya, Rajni, Gangapur, Dinapatti Sakhuwa, Pokhram Parmanadpur, Jorgama, and Rampur gram panchayats and Murliganj notified area of Murliganj CD Block.

[2] Biharganj Assembly constituency is part of No.