Khagaria Assembly constituency is an assembly constituency in Khagaria district in the Indian state of Bihar. In the 2015 Bihar Legislative Assembly election, Khagaria was one of the 36 seats to have VVPAT enabled electronic voting machines.
As per the Delimitation of Parliamentary and Assembly Constituencies Order, 2008, No. 149 Khagaria Assembly constituency comprises the following: Khagaria municipality; Mansi community development block; and Bhadas Dakshini, Bhadas Uttari, Kasimpur, Mathurapur, Bachhouta, Sanhouli, Ranko, Sansarpur, Gourashakti, Marar Dakshini, Marar Uttari, Rasounk, Uttar Marar, Rahimpur Uttari, Rahimpur Madhya, Rahimpur Dakshin, Labhganva and Kothia gram panchayats of Khagaria CD Block.
Khagaria Assembly constituency is part of No. 25 Khagaria (Lok Sabha constituency).