Nighasan Assembly constituency is one of the 403 constituencies of the Uttar Pradesh Legislative Assembly, India. It is a part of the Lakhimpur Kheri district and one of the five assembly constituencies in the Kheri (Lok Sabha Constituency). First election in this assembly constituency was held in 1957 after the "DPACO (1956)" (delimitation order) was passed in 1956. After the "Delimitation of Parliamentary and Assembly Constituencies Order" was passed in 2008, the constituency was assigned identification number 138.