Bangaon Dakshin Assembly constituency

In the 2021 election, Swapan Majumder of BJP defeated his nearest rival ALO RANI SARKAR of AITC.

In the 2011 election, Surajit Kumar Biswas of Trinamool Congress defeated his nearest rival Anuj Baran Sarkar of CPI(M).

In the 2009 bye-election caused by the election of sitting MLA, Saugata Roy to the Lok Sabha from Dum Dum, Gopal Seth of All India Trinamool Congress won the Bangaon seat.[18][19]

In the 2006 bye-election caused by the death of the sitting MLA, Bhupen Seth, Saugato Roy of Trinamool Congress defeated Pankaj Ghosh of CPI(M).[17]

In the 2006 state assembly elections,[16] Bhupendranath Seth of All India Trinamool Congress won the Bongaon assembly seat defeating his nearest rival Pankaj Ghosh of CPI(M). Contests in most years were multi cornered but only winners and runners are being mentioned. Pankaj Ghosh of CPI(M) defeated Bhupendranath Seth, Independent and Congress respectively) in 2001[15] and 1996.[14] Bhupendranath Seth of Congress defeated Ranajit Mitra of CPI(M) in 1991.[13] Ranajit Mitra of CPI(M) defeated Bhupendranath Seth of Congress in 1987.[12] Bhupendranath Seth of Congress defeated Ranajit Mitra of CPI(M) in 1982.[11] Ranajit Mitra of CPI(M) defeated Bhupendranath Seth of Congress in 1977.[10][24]

Ajit Kumar Ganguly of CPI won in 1972,[9] 1971[8] and 1969.[7] K.Bhowmick of Congress won in 1967.[6] Jiban Ratan Dhar of Congress won in 1962.[5] In 1957, Bongaon was a joint seat. Ajit Kumar Ganguly of CPI and Manindra Bhusan Biswas of Congress won in 1957.[4] Jiban Ratan Dhar of Congress won in 1951.[3]