Nalwa became a new Assembly constituency of Legislative Assembly of Haryana in the state of Haryana in the 2008 delimitation exercise. Earlier, most of the villages of this constituency were under Adampur, a stronghold of Bhajan Lal. Some of the villages were earlier with the Bawani Khera Constituency.
Nalwa constituency was represented by an ex-minister of Haryana and senior Congress leader of the Haryana State Assembly, Professor Sampat Singh. He won the October 2009 elections with a margin of 10,901 votes, defeating Jasma Devi of the Haryana Janhit Congress. Jasma Devi is the wife of Bhajan Lal and this was the first defeat of the Bhajanlal clan in Haryana state politics. This defeat led to the downfall of Bhajanlal's Haryana Janhit Congress in literal terms for just after winning, five out of total six MLAs of Haryana Janhit Congress left the HJC and joined the Congress.
^"Haryana Results". Election Commission of India, Constituencywise-All Candidates. Archived from the original on 16 December 2014. Retrieved 19 October 2014.
