Mangaldai Assembly constituency is one of the 126 constituencies in the Assam Legislative Assembly, formerly listed as Mangaldoi before the 2023 delimitation updated the name. It is a Scheduled Castes (SC) reserved seat in Darrang district and falls under the Mangaldoi Lok Sabha constituency.
The main political parties in Assam include the Bharatiya Janata Party (BJP), Congress, Asom Gana Parishad (AGP), All India United Democratic Front (AIUDF), Bodoland People's Front (BPF), United People's Party Liberal (UPPL), and the Communist Party of India (Marxist) (CPM).
In the 2016 Assam Assembly elections, BJP's Gurujyoti Das won with 73,423 votes (41.31 per cent), defeating INC's Basanta Das (51,378 votes) by 22,045 votes — a strong NDA majority in this SC reserved seat. The constituency had approximately 1.78 lakh registered electors in 2016 with high turnout of 88.84 per cent. In 2026, BJP fields Nilima Devi while Congress fields Rijumoni Talukdar for this renamed constituency.
The 2026 Assam Assembly elections will test Chief Minister Himanta Biswa Sarma's BJP-led government, which swept to power with a comfortable majority in 2021. With the opposition Congress-AIUDF combine seeking to consolidate anti-incumbency sentiment, every constituency will be a crucial battleground in deciding whether the state returns a second consecutive BJP government.