Valmiki Nagar Assembly constituency is an assembly constituency in West Champaran district in the Indian state of Bihar. Surendra Prasasd Kushwaha of INC is the incumbent MLA.
As per orders of Delimitation of Parliamentary and Assembly constituencies Order, 2008, No. 1 Valmiki Nagar Assembly constituency is composed of the following: Piprasi, Madhubani, Thakrahan and Bhitaha community development blocks; and Valmiki Nagar, Laxmipur Rampurwa, Santpur Soharia, Champapur Gonauli, Naurangia Dardari, Mahuawa Katharawa, Harnatand, Balua Chhatraul, Dewaria Taruanwa, Bharachhi, Belahawa Madanpur, Bakuli Panchgwa, Binwalia Bodhser, Nayagaon Rampur, Mangalpur Ausani, Borawal Narawal, Semra Katkuiya, Yamunapur Tadwalia, Jimari Nautanawa and Dholbajwa Laxmipur gram panchayats of Sidhaw CD Block.
Valmiki Nagar Assembly constituency is part of No. 1 Valmiki Nagar (Lok Sabha constituency).