The By-elections for the 17th West Bengal Legislative Assembly were a series of by-elections held to fill vacant seats in the West Bengal Legislative Assembly between 2021 and 2025. Vacancies arose due to the deaths, resignations, or disqualifications of sitting members of the legislative assembly (MLAs). The by-elections were conducted by the Election Commission of India (ECI). The All India Trinamool Congress (AITC or TMC) won the majority of the contested seats during this period.
2021 DateConstituencyPrevious MLA ReasonElected MLA 30 September 2021 159 Bhabanipur Sovandeb Chattopadhyay Resigned on 21 May 2021 Mamata Banerjee 30 October 2021 7 Dinhata Nisith Pramanik Resigned on 12 May 2021 Udayan Guha86 Santipur Jagannath Sarkar Braja Kishore Goswami109 Khardaha Kajal Sinha Died on 25 April 2021 Sovandeb Chattopadhyay127 Gosaba Jayanta Naskar Died on 19 June 2021 Subrata Mondal
2022 DateConstituencyPrevious MLA ReasonElected MLA12 April 2022161BallygungeSubrata Mukherjee Died on 4 November 2021Babul Supriyo
2023 DateConstituencyPrevious MLA ReasonElected MLA27 February 202360SagardighiSubrata Saha Died on 29 December 2022Bayron Biswas5 September 202315DhupguriBishnu Pada RoyDied on 25 July 2023Nirmal Chandra Roy
2024 DateConstituencyPrevious MLA ReasonElected MLA7 May 2024 62BhagabangolaIdris Ali Died on 16 February 2024Reyat Hossain Sarkar1 June 2024 113BaranagarTapas RoyResigned on 4 March 2024Sayantika Banerjee10 July 2024 35RaiganjKrishna KalyaniResigned on 27 March 2024Krishna Kalyani 90Ranaghat DakshinMukut Mani AdhikariResigned on 19 April 2024Mukut Mani Adhikari 94BagdahBiswajit DasMadhuparna Thakur 167ManiktalaSadhan PandeDied on 20 February 2022Supti Pandey 13 November 2024 6SitaiJagadish BasuniaElected to Lok Sabha on 4 June 2024Sangita Roy 14MadarihatManoj TiggaJay Prakash Toppo 104NaihatiPartha BhowmickSanat Dey 121HaroaHaji Nurul IslamSheikh Rabiul Islam 236MedinipurJune MaliaSujoy Hazra 251TaldangraArup ChakrabortyFalguni Singhababu
2025 DateConstituencyPrevious MLA ReasonElected MLA 19 June 202580KaliganjNasiruddin Ahamed Died on 1 February 2025Alifa Ahmed
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