Polling began for the by-election to the Rupauli assembly seat in Bihar on Wednesday, amid tight security arrangements, an official said.
The voting started at 7 am and will continue till 6 pm.
More than three lakh voters will decide the electoral fate of 11 candidates.
The by-poll was necessitated by the resignation of sitting MLA Bima Bharti, who won the seat for JD(U) several times but quit the party to contest Lok Sabha elections on an RJD ticket.
She lost her deposit in the parliamentary poll and is again in the fray for the by-poll as an Rashtriya Janata Dal candidate.
The Janata Dal(United) has fielded Kaladhar Prasad Mandal, who had contested the 2020 assembly polls from Rupauli as an Independent.
Former MLA Shankar Singh, who had quit the LJP (Ram Vilas) headed by Union minister Chirag Paswan, is also in the fray as an Independent.
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